Articles de revues : « NONLINEAR CRYSTAL »

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Mao, Ningbin, Yutao Tang, Mingke Jin, Guanqing Zhang, Yang Li, Xuecai Zhang, Zixian Hu et al. « Nonlinear wavefront engineering with metasurface decorated quartz crystal ». Nanophotonics 11, n^o 4 (2 novembre 2021) : 797–803. http://dx.doi.org/10.1515/nanoph-2021-0464.

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Abstract In linear optical processes, compact and effective wavefront shaping techniques have been developed with the artificially engineered materials and devices in the past decades. Recently, wavefront shaping of light at newly generated frequencies was also demonstrated using nonlinear photonic crystals and metasurfaces. However, the nonlinear wave-shaping devices with both high nonlinear optical efficiency and high wave shaping efficiency are difficult to realize. To circumvent this constraint, we propose the idea of metasurface decorated optical crystal to take the best aspects of both traditional nonlinear crystals and photonic metasurfaces. In the proof-of-concept experiment, we show that a silicon nitride metasurface decorated quartz crystal can be used for the wavefront shaping of the second harmonic waves generated in quartz. With this crystal-metasurface hybrid platform, the nonlinear vortex beam generation and nonlinear holography were successfully demonstrated. The proposed methodology may have important applications in nonlinear structured light generation, super-resolution imaging, and optical information processing, etc.

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KIRUBAVATHI, K., K. SELVARAJU, N. VIJAYAN et S. KUMARARAMAN. « GROWTH AND CHARACTERIZATION OF GLYCINE HYDROBROMIDE SINGLE CRYSTAL FOR NONLINEAR OPTICAL APPLICATIONS ». Modern Physics Letters B 22, n^o 21 (20 août 2008) : 2035–42. http://dx.doi.org/10.1142/s0217984908016716.

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Single crystals of a new semi-organic nonlinear optical material glycine hydrobromide were grown from solution by slow evaporation at room temperature. Good optical quality single crystals with dimensions 17×8×5 mm3 were obtained. The grown crystal had been confirmed by single-crystal X-ray diffraction and the vibrational frequencies of various functional groups in the crystals had been derived from Fourier transform infrared spectrum. The optical quality of the grown crystals was analyzed by the Ultraviolet visible spectrum method. The mechanical behavior of the grown crystal was evaluated by Vickers' micro-hardness indentation method. The nonlinear optical property of the crystal was confirmed by the Kurtz powder technique using Nd : YAG laser as a source.

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Anis, Mohd, S. S. Hussaini, M. D. Shirsat et G. G. Muley. « Investigation on nonlinear optical and dielectric properties of L-arginine doped ZTC crystal to explore photonic device applications ». Materials Science-Poland 34, n^o 3 (1 septembre 2016) : 548–54. http://dx.doi.org/10.1515/msp-2016-0070.

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AbstractThe present study is focused to explore the photonic device applications of L-arginine doped ZTC (LA-ZTC) crystals using nonlinear optical (NLO) and dielectric studies. The LA-ZTC crystals have been grown by slow evaporation solution technique. The chemical composition and surface of LA-ZTC crystal have been analyzed by means of energy dispersive spectroscopy (EDS) and surface scanning electron microscopy (SEM) techniques. The Vicker’s microhardness study has been carried out to determine the hardness, work hardening index, yield strength and elastic stiffness of LA-ZTC crystal. The enhanced SHG efficiency of LA-ZTC crystal has been ascertained using the Kurtz-Perry powder SHG test. The closed-and-open aperture Z-scan technique has been employed to confirm the third order nonlinear optical nature of LA-ZTC crystal. The Z-scan transmittance data has been utilized to calculate the superior cubic susceptibility, nonlinear refractive index, nonlinear absorption coefficient and figure of merit of LA-ZTC crystal. The behavior of dielectric constant and dielectric loss of LA-ZTC crystal at different temperatures has been investigated using the dielectric analysis.

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Kulkarni, R. B., M. Anis, S. S. Hussaini et M. D. Shirsat. « Tuning optical properties of cadmium thiourea acetate nonlinear optical crystal exploiting organic ligand of L-proline ». Modern Physics Letters B 33, n^o 01 (10 janvier 2019) : 1850424. http://dx.doi.org/10.1142/s0217984918504249.

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Modifying optical properties of crystal is very fundamental need for designing various photonic devices, hence in the current investigation, the L-proline (LP) has been firstly doped in cadmium thiourea acetate (CTA) crystal with the aim to optimize the UV–Visible, second harmonic generation (SHG) efficiency, luminescence and third-order nonlinear optical (TONLO) properties of CTA crystal. The pure and doped CTA crystals have been grown by slow solvent evaporation technique at [Formula: see text]C. The structural parameters of grown crystals have been determined using the single crystal X-ray diffraction technique. The incorporation of LP in CTA crystal matrix has been confirmed by Fourier transforms infrared analysis. The UV–Visible studies have been employed within the wavelength range of 200–900 nm to explore the enhancing impact of LP on CTA crystal. The LP doped CTA crystals were subjected to Kurtz–Perry test and Z-scan analysis to identify the nonlinear nature of studied crystals. The SHG efficiency of LP-CTA crystal shows significant increase owing to enhanced charge transfer over the organic ligand of LP. The laser-induced TONLO properties of LP-doped CTA crystal have been determined at 632.8 nm. The nature of nonlinear refraction and absorption has been explored by close and open aperture Z-scan configuration. The magnitude of nonlinear refraction [Formula: see text], absorption coefficient [Formula: see text], cubic susceptibility [Formula: see text] and figure of merit has been determined using the transmittance data. The color-centered luminescence studies have been carried out which established the prominent redshift in peak maxima of emission wavelength of CTA crystal due to doping of LP. Comparative analysis of pure and doped crystal confirmed the dominance of LP doping.

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UPADHYAY, P. K., et A. K. NAGAR. « SOLITON PULSE ANALYSIS IN GaInP PHOTONIC CRYSTAL WAVEGUIDE ». International Journal of Modern Physics : Conference Series 22 (janvier 2013) : 675–78. http://dx.doi.org/10.1142/s2010194513010842.

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Solitons are nonlinear waves that remain invariant as they propagate. Precise control of dispersion and nonlinear effects govern soliton propagation. In recent years Photonic crystals (PhCs) have attracted a great deal of attention due to the facility to engineer and enhance both their nonlinear and dispersive effects. In this article we show soliton pulse analysis in GaInP Photonic Crystal Waveguides using AUTO bifurcation analysis tool. We have demonstrated pulse compression at moderately slow velocities in GaInP Photonic Crystal Waveguides. This is enabled by the enhanced self phase modulation and strong negative group velocity dispersion in the Photonic Crystal Waveguides.

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KIRUBAVATHI, K., K. SELVARAJU et S. KUMARARAMAN. « STUDIES ON GROWTH AND CHARACTERIZATION OF BIS THIOUREA LEAD CHLORIDE : A NOVEL NONLINEAR OPTICAL CRYSTAL ». Journal of Nonlinear Optical Physics & ; Materials 18, n^o 01 (mars 2009) : 153–59. http://dx.doi.org/10.1142/s0218863509004531.

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Single crystals of the metal-organic nonlinear optical material bis thiourea lead chloride were grown from solution growth technique for the first time. The grown crystals were characterized by single crystal X-ray diffraction analysis to confirm the crystal structure. The presence of various functional groups and the coordination of metal ions to thiourea were confirmed by Fourier transform infrared analysis. UV-Vis. spectrum was recorded to study the optical transparency of the grown crystals. The second order nonlinear optical property of the grown crystal was examined by Kurtz powder technique and mechanical behavior was studied by Vickers micro hardness test.

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Dhanaraj, P. V., et N. P. Rajesh. « Investigations on Nonlinear Optical 2-Aminopyridine Derivative Single Crystals ». Advanced Materials Research 685 (avril 2013) : 211–15. http://dx.doi.org/10.4028/www.scientific.net/amr.685.211.

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Nonlinear optical materials 2-aminopyridinium trifluoroacetate and bis (2-aminopyridinium) sulfate, were synthesized and single crystals were grown from aqueous solution employing the technique of controlled evaporation. The solubility and metastable zone width were found. The crystal structure was analyzed to reveal the molecular arrangements and the formation of hydrogen bonds in the crystal. High-resolution X-ray diffraction rocking curve measurements were performed to analyze the structural perfection of the grown crystals. Functional groups were identified and thermal behaviour and stability were studied. Mechanical and dielectric properties of crystals were analyzed. Optical studies reveal that both crystals have good transparency window. The nonlinear optical parameters of crystals were derived.

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Rajeswari, A., et P. Murugakoothan. « Growth and Characterization of Non-Linear Optical Single Crystal Guanidinium triscadmium Sulphate Octahydrate ». Asian Journal of Chemistry 31, n^o 3 (2019) : 661–68. http://dx.doi.org/10.14233/ajchem.2019.21722.

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Semi-organic single crystals of guanidinium tris cadmium sulphate octahydrate (GuCdS) with nonlinear optical properties were successfully grown by slow solvent evaporation technique. The grown crystals were characterised by powder X -ray diffraction analysis to determine the unit cell parameters. The structure of the compound belongs to triclinic crystal system and space group is found to be P1. The grown crystals were subjected to FTIR spectroscopic analysis to confirm the presence of functional groups present in the compound. UV-vis-NIR spectral study suggested that the grown crystal is transparent in the entire visible region, the lower cut off wavelength is 200 nm and the band gap value is estimated to be 6.14 eV. Nonlinear refractive index (n2), absorption coefficient (β) and third order nonlinear susceptibility (χ(3)) were calculated using Z-scan technique. The thermal stability of grown crystal was investigated by thermogravimetric and differential thermogravimetric analyses. The dielectric behaviour of the grown crystal was analyzed as a function of frequency of the applied field. The mechanical properties of grown crystal were examined by Vickers′s micro hardness test. The laser damage threshold of the grown crystal was calculated to be 1.796 GW/cm2.

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Xia, Mingjun, Bo Xu, Lijuan Liu, Xiaoyang Wang, Rukang Li et Chuangtian Chen. « Thermo-physical properties of nonlinear optical crystal K3B6O10Br ». Journal of Applied Crystallography 49, n^o 2 (8 mars 2016) : 539–43. http://dx.doi.org/10.1107/s1600576716001126.

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The thermo-physical properties of the nonlinear optical (NLO) crystal K3B6O10Br (KBB) were experimentally investigated, including specific heat, thermal conductivity, coefficient of thermal expansion and refractive index. The specific heat of KBB is lower than that of LiB3O5 and higher than that of other borate NLO crystals, such as β-BaB2O4, CsLiB6O10 and CsB3O5, and KBB manifests a high damage threshold because of its lower temperature gradient during laser pulse irradiation. The thermal expansion coefficients were obtained as α x = 5.09 × 10−6 K−1 and α z = 2.39 × 10−5 K−1, showing weaker anisotropy than those of commonly used NLO crystals. The temperature-dependent Sellmeier dispersion equations of the refractive indices were also obtained, and the phase-matching angles for second harmonic generation (SHG) at temperatures of 313, 343, 373, 403 and 433 K which were calculated from these equations are in good agreement with the experimental values. All results are indicative of the KBB crystal as a novel promising NLO crystal for high power SHG.

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Sreenivasan, R. S., N. Kanagathara, G. Ezhamani, N. G. Renganathan et G. Anbalagan. « Effect of Metal Dopant on Ninhydrin—Organic Nonlinear Optical Single Crystals ». Journal of Spectroscopy 2013 (2013) : 1–5. http://dx.doi.org/10.1155/2013/386024.

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In the present work, metal (Cu2+)-substituted ninhydrin single crystals were grown by slow evaporation method. The grown crystals have been subjected to single crystal XRD, powder X-ray diffraction, FTIR, dielectric and SHG studies. Single crystal X-ray diffraction analysis reveals that the compound crystallizes in monoclinic system with noncentrosymmetric space group P21 with lattice parametersa=11.28 Å,b=5.98 Å,c=5.71 Å,α=90∘,β=98.57,γ=90∘, andV=381 (Å)3, which agrees very well with the reported value. The sharp and strong peaks in the powder X-ray diffraction pattern confirm the good crystallinity of the grown crystals. The presence of dopants marginally altered the lattice parameters without affecting the basic structure of the crystal. The UV-Vis transmittance spectrum shows that the crystal has a good optical transmittance in the entire visible region with lower cutoff wavelength 314 nm. The vibrational frequencies of various functional groups in the crystals have been derived from FT-IR analysis. Based on the shifts in the vibrations, the presence of copper in the lattice of the grown crystal is clearly established from the pure ninhydrin crystals. Both dielectric constant and dielectric loss decrease with the increase in frequency. The second harmonic generation efficiency was measured by employing powder Kurtz method.

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Khoo, I. C., Andres Diaz, J. Ding, K. Chen et Y. Zhang. « Collective and Individual Molecular Nonlinear Photonics of Liquid Crystals ». Journal of Nonlinear Optical Physics & ; Materials 12, n^o 02 (juin 2003) : 277–89. http://dx.doi.org/10.1142/s0218863503001390.

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This review will examine the origins of nonlinear light scattering processes in nematic liquid crystals, and explore various nonlinear photonic processes associated with optically induced director axis reorientation effects. Our theoretical prediction shows that the upper limit of nematic liquid crystal reorientation nonlinearity can be as high as 1000 cm2/W. The supra-nonlinear responses of nematic liquid crystals enable various self-action or electro-optical guiding, mixing, switching and modulation of light with unprecedented low power thresholds. Owing to the broadband birefringence of NLC, we expect to realize optical elements/devices capable of similar multi-functional operations throughout the visible — infrared regime. We also discuss the optical limiting action of isotropic-phase liquid crystal filled nonlinear fiber arrays.

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CHEN, GUIHUA, SHAOQIANG ZHANG et MUYING WU. « OPTICAL SOLITONS IN A TRINAL-CHANNEL INVERTED NONLINEAR PHOTONIC CRYSTAL ». Journal of Nonlinear Optical Physics & ; Materials 22, n^o 01 (mars 2013) : 1350012. http://dx.doi.org/10.1142/s0218863513500124.

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Inverted nonlinear photonic crystals are the crystals featuring competition between linear and nonlinear lattices, with minima of the linear potential coinciding with maxima of the nonlinear pseudopotential, and vice versa. Traditional inverted nonlinear photonic crystals only have two channels, and can be attained experimentally by means of Rhodamine B (RhB, a dye featuring saturable absorption) doped into the SU-8 polymer. In this paper, a new type of inverted nonlinear photonic crystal is constructed by juxtaposing three kinds of channels into a period. These three channels are a purely linear channel, a saturable self-focusing nonlinear channel, and a saturable self-defocusing nonlinear channel. This optical device is assumed to be fabricated by means of SU-8 polymer material periodically doped with two types of active dyes. The nonlinear propagation of a light field inside this device (passing along the channel) can be described by a nonlinear Schrödinger equation. Stable multi-peak fundamental and dipole solitons are found in the first gap of the system. These solitons sufficiently exhibit some interesting digital properties, which may have potential in optical communications.

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Peramaiyan, G., P. Pandi, B. M. Sornamurthy et R. Mohan Kumar. « Synthesis, Growth and Characterization of Organic Nonlinear Optical L-Asparagine L-Tartrate Single Crystals ». Advanced Materials Research 584 (octobre 2012) : 13–17. http://dx.doi.org/10.4028/www.scientific.net/amr.584.13.

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L-asparagine L-tartrate (LAT), an organic compound has been synthesized from aqueous solution and bulk single crystal has been grown by slow evaporation technique. Powder X-ray diffraction studies confirmed the monoclinic structure of the grown LAT crystal. The presence of functional groups of the grown crystal was identified by FTIR studies. Linear optical property of the grown crystal was studied by UV-Vis spectral analysis. Microhardness studies reveal that the crystal possesses relatively higher hardness compared to other organic nonlinear optical crystals. Dielectric response of the L-asparagine L-tartrate crystal was analyzed for different frequencies at various temperatures. Kurtz-Perry powder second harmonic generation test confirmed the nonlinear optical properties of the as-grown LAT crystal.

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Arthi, A. P., M. Sumithra Devi et K. Thamizharasan. « Structural, Microhardness, Photoconductivity, and Dielectric Properties of Tris(thiourea) Cadmium Sulphate Single Crystals ». Journal of Solid State Physics 2014 (20 novembre 2014) : 1–5. http://dx.doi.org/10.1155/2014/153272.

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Semiorganic nonlinear optical tris(thiourea) cadmium sulphate (TTCS) single crystals were grown by slow evaporation method. The crystal system, cell parameter of the grown crystal, was identified by powder X-ray diffraction study. The self-focusing Z-scan technique has been employed to observe the third-order nonlinear optical property of the grown crystal. The mechanical property of the grown crystal was examined by using Vicker’s microhardness test. Chemical etching studies were made on the TTCS crystal using water as an etchant. The dark current and photocurrent properties of the crystal were estimated by using photoconductivity study. The dielectric constant of grown crystal was studied in different temperature by varying applied frequencies.

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Sun, Zhenjie. « Application of third-order nonlinear optical materials in complex crystalline chemical reactions of borates ». Nonlinear Engineering 11, n^o 1 (1 janvier 2022) : 609–14. http://dx.doi.org/10.1515/nleng-2022-0234.

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Abstract In order to explore the application of third-order nonlinear optical (NLO) materials in complex borate crystalline chemical reactions, the laser light source with limited wavelength range can be extended to ultraviolet (UV) and deep UV region by using NLO crystal materials and frequency conversion technology, which has become a hot research direction of deep UV light source. The experimental results show that the UV cutoff edge of the grown KLi(HC3N3O3)·2H2O crystal is 237 nm. The refractive index of the crystal was measured by prism coupling technique, and the Sellmeier equation of the refractive index of the crystal was fitted. The chemical bond of the crystal is a fundamental means to understand the relationship between structure and properties. With the emergence of a large number of hybrid functional crystals, the composition and structure of crystals become more complex, and the chemical bond theory has also been greatly developed, and then the chemical bond theory of meta crystals or complex crystals has emerged. Once proposed, the theory has been widely used, such as analyzing the eligibility of luminescent crystals, NLO crystals and high-temperature superconductor crystals. NLO materials are the dominant field of China in the world. Crystals with good nonlinear behavior have more complex crystal structures, due to the theory of amorphous structure, the exploration of this aspect is particularly difficult. For the first time, the influence of the composition of rare earth-doped bismuth borate glass on the crystal precipitation and glass microstructure of NLO materials was systematically studied, which laid a theoretical foundation for further development and understanding of new bismuth borate optical systems.

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Sakthy Priya, S., K. Balakrishnan, A. Lakshmanan, P. Surendran, P. Rameshkumar, Karthik Kannan, P. Geetha, Tejaswi Ashok Hegde et G. Vinitha. « Crystal growth and characterization of Benzimidazolium salicylate single crystal for nonlinear optical studies and antibacterial activity ». Physics and Chemistry of Solid State 21, n^o 3 (29 septembre 2020) : 377–89. http://dx.doi.org/10.15330/pcss.21.3.377-389.

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Organic non-linear optical Benzimidazolium salicylate (BISA) single crystals have been harvested from methanol solution by slow evaporation method. The grown crystals belong to the monoclinic crystal system with space group P21/c. Good crystalline nature of grown BISA crystal was confirmed by PXRD. The FTIR spectrum analysis affirms the presence of functional groups in BISA crystal. From the UV‒Vis-Absorption spectrum, the lower cut-off wavelength (356 nm) and its energy band gap and linear refractive index were calculated. Luminescence spectrum was recorded to explore the emission peak at 426 nm. The mechanical strength of BISA crystal was determined by Vickers microhardness tester and mechanical parameters like C11, Hk, Kc, and Bi were calculated for the first time. Dielectric properties of grown crystals were systematically investigated for different temperatures. Further, electronic polarizability (α) were calculated using Penn analysis and Clausius‒Mossotti equation. Z‒scan measurement was taken to explore the third-order NLO properties of BISA crystal. For the first attempt, the BISA crystals were tested against five human pathogenic bacterial, i.e. Bacillus cereus, Staphylococcus aureus, Shigella flexneri, Vibrio cholerae, and Klebsiella pneumoniae. Existing results established that Benzimidazolium salicylate crystals might find useful applications in nonlinear optics and antimicrobial field.

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Wang, Bingxia, Shan Liu, Tianxiang Xu, Ruwei Zhao, Peixiang Lu, Wieslaw Krolikowski et Yan Sheng. « Nonlinear Talbot self-healing in periodically poled LiNbO3 crystal [Invited] ». Chinese Optics Letters 19, n^o 6 (2021) : 060011. http://dx.doi.org/10.3788/col202119.060011.

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Poirier, Louis, et Alain Haché. « Nonlinear coaxial photonic crystal ». Applied Physics Letters 78, n^o 18 (30 avril 2001) : 2626–28. http://dx.doi.org/10.1063/1.1367296.

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Khoo, I. C. « Liquid Crystal Nonlinear Optics ». Acta Physica Polonica A 86, n^o 1-2 (juillet 1994) : 267–78. http://dx.doi.org/10.12693/aphyspola.86.267.

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Deepa, B., et P. Philominathan. « Optical, mechanical and thermal behaviors of Nitrilotriacetic acid single crystal ». International Journal of Modern Physics B 31, n^o 28 (9 novembre 2017) : 1750200. http://dx.doi.org/10.1142/s0217979217502009.

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An organic nonlinear single crystal of Nitrilotriacetic acid (NTAA) was grown for the first time by employing a simple slow evaporation technique. Single crystal X-ray diffraction (XRD) analysis reveals that the grown crystal belongs to the monoclinic system with noncentrosymmetric space group [Formula: see text]. Fourier transform infrared (FTIR) spectral study ascertains the presence of functional groups in NTAA. The molecular structure of the grown crystal was confirmed by Nuclear Magnetic Resonance (NMR) spectral analysis. The optical parameters such as transmittance, absorption coefficient and band gap were calculated from UV–Visible and fluorescence studies. Dielectric measurements were carried out for different frequency and temperature. The mechanical strength of the grown crystal was measured using Vickers microhardness test. The high thermal stability and the melting point of the grown crystal were also estimated using thermogravimetric (TGA) and differential thermal analyses (DTA). The confirmation of the grown crystals belonging to nonlinear optical crystals was performed by Kurtz–Perry technique and found as suitable candidate for optoelectronics applications.

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Segonds, Patricia, Benoit Boulanger et Peter Schunemann. « Nonlinear crystals for frequency conversion ». Photoniques, n^o 116 (2022) : 64–68. http://dx.doi.org/10.1051/photon/202211664.

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Crystals can convert wavelengths emitted by lasers using a second-order process. They allow light to be generated with smaller or higher wavelengths than those of the input beam. The issue is to select the nonlinear crystal having the best conversion efficiency at the targeted wavelengths, which requires a high non-linearity and suited transparency range as well as phase-matching conditions.

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Selvapandiyan M et Arumugam J. « Crystal growth, structural, spectral, optical and mechanical studies of zinc (tris) thiourea sulphate (ZTS) single crystals : A semiorganic non-linear optical material ». INTERNATIONAL JOURNAL OF SCIENCE TECHNOLOGY AND HUMANITIES 2, n^o 2 (30 octobre 2015) : 5–8. http://dx.doi.org/10.26524/ijsth44.

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Zinc-tris thiourea sulphate (ZTS) is one of the promising semiorganic nonlinear optical materials; it is useful for nonlinear optical applications. The grown crystals were subjected to single crystal Xray diffraction, UV-visible spectrum, FTIR, microhardness and SHG studies. Single crystal X- ray diffraction analysis revealed that the grown crystal belongs to orthorhombic system with space groupPca21 . Various functional groups present in the sample were identified by FTIR analysis. UV visible transmittance spectrum shows that the wide transmittance and lower cut-off wavelength. The mechanical property of the grown crystal has been analysed by Vickers microhardness test. Second harmonic generation was confirmed by using Nd: YAG laser. The second harmonic generation results confirmed that the crystal has better nonlinearity than KDP crystal.

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JONSSON, FREDRIK, et CHRISTOS FLYTZANIS. « OPTICAL AMPLITUDE AND PHASE EVOLUTION IN NONLINEAR MAGNETO-OPTICAL BRAGG GRATINGS ». Journal of Nonlinear Optical Physics & ; Materials 13, n^o 01 (mars 2004) : 129–54. http://dx.doi.org/10.1142/s0218863504001803.

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We present a theory on stratified nonlinear magneto-photonic crystals, with arbitrary spatial distribution of the refractive index and magneto-optical coefficients. The coupled mode theory is formulated for plane waves inside the crystal, and a perturbation series of integral solutions for the spectral response of the crystal is presented. Material issues and configurations are discussed, and the described theory is applied to the calculation of transmission spectra of binary magneto-photonic crystals.

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ABBATE, G., L. DE STEFANO, E. SANTAMATO, G. SCALIA et P. MORMILE. « EXPERIMENTAL OBSERVATION OF NONLINEAR BEAM SPLITTING IN DYE-DOPED LIQUID CRYSTAL WAVEGUIDES ». Journal of Nonlinear Optical Physics & ; Materials 08, n^o 03 (septembre 1999) : 319–27. http://dx.doi.org/10.1142/s0218863599000229.

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Liquid crystals have effective nonlinear optical coefficients that are orders of magnitude larger than other materials exploited in integrated optics. The addition of some organic dyes in small amounts may further enhance the nonlinear optical response and even change its sign. We used a dye-nematic liquid crystal mixture exhibiting a negative optical nonlinearity. We observed the nonlinear spatial splitting of the guided modes in a symmetric planar waveguide whose core was the liquid crystal mixture. This non-linear effect has been observed with very low laser power input and the power threshold dependence on dye concentration and core thickness was investigated.

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Gurumurthi, T., et P. Murugakoothan. « Synthesis, Growth and Characterisation of Nonlinear Optical Nb-Doped L-Prolinium Picrate Single Crystals ». Advanced Materials Research 584 (octobre 2012) : 97–101. http://dx.doi.org/10.4028/www.scientific.net/amr.584.97.

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A nonlinear optical material Niobium doped L-Prolinium Picrate was synthesized and grown as single crystals by slow evaporation method. The grown crystals were subjected to structural, elemental, thermal, optical and dielectric studies. The structural analysis reveals that Nb : LPP belongs to the monoclinic crystallographic system with space group P21. Optical transparency of the grown crystals was investigated by UV-vis-NIR spectrum. The thermal analyses reveal that Nb doped L-Prolinium Picrate is thermally stable up to 185 °C. The dielectric constant and dielectric loss of the crystal were studied as a function of frequency. The nonlinear optical property of the grown crystal was confirmed by the Kurtz-powder second harmonic generation test and the results are compared with pure LPP. Mechanical strength of the crystal was also carried out by Vicker’s micro hardness test.

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Perumal, R., S. Thanikaikarasan, M. Saravannan, R. Kanimozhi et S. Sudharthini. « Influence of Halogens on the Growth Aspects of Allylthiourea Cadmium Complex Nonlinear Optical Single Crystals ». Journal of New Materials for Electrochemical Systems 25, n^o 2 (10 juin 2022) : 110–15. http://dx.doi.org/10.14447/jnmes.v25i2.a04.

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Allylthiourea complex crystals is an organometallic complex, a new nonlinear optical materials with high second harmonic generation effect. Tri-allylthiourea cadmium chloride and Tri-allylthiourea cadmium bromide are the promising nonlinear optical crystals belonging to this family. Both the crystals have been grown from an aqueous solution by slow cooling technique. The solubility and growth optimization of the grown crystals in terms of pH were analyzed and the influence of the different halogen atoms on the properties of as grown single crystals was studied by conducting various characterization techniques. Powder X-ray diffraction studies revealed that both the crystals are trigonal crystal structure with R3C space group. The spectroscopic properties were investigated by recording the Fourier Transform Infra Red and UV-Visible-NIR spectroscopy. Spectrocopic study confirmed the coordination of metal and red shift of the grown crystal. Nonlinear behavior of the as grown crystals was identified by Kurtz powder technique. Thermal and electrical properties of the as grown crystals were also analyzed by thermogravimetric and dielectric studies. Influence of the halogens on the growth as well as the properties were studied.

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Petrosyan, A. M., S. S. Terzyan, V. M. Burbelo et R. P. Sukiasyan. « Investigation of Some New Nonlinear Optical Crystals by Means of NQR, IR and X-Ray Diffraction Methods ». Zeitschrift für Naturforschung A 53, n^o 6-7 (1 juillet 1998) : 528–36. http://dx.doi.org/10.1515/zna-1998-6-741.

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Abstract Some new analogues of the nonlinear optical crystal L-arginine phosphate monohydrate (LAP) (Arg • HIO3 , Arg • 2HIO3 , Lys • HIO3 , Lys • 2HIO3 , Lys • 3HIO3 , Bet • 3HIO3) were obtained and investigated by means of IR, NQR, X-ray diffraction and SHG methods. The importance of this class of crystals for revealing new nonlinear optical crystals is pointed out.

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Савотченко, С. Е. « Поверхностные волны на границе фоторефрактивного кристалла и среды с положительной керровской нелинейностью ». Физика твердого тела 62, n^o 6 (2020) : 902. http://dx.doi.org/10.21883/ftt.2020.06.49345.624.

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The types of nonlinear surface waves of extraordinary polarization that occur at the interface between a photorefractive crystal and a medium with positive Kerr nonlinearity are described. It is shown that nonlinear surface waves of an asymmetric profile of two types can exist in such a system. The waves of the first type decay when moving away from the interface without oscillations both in the depth of the photorefractive crystal and in the Kerr crystal, and the waves of the second type decay in the depth of the photorefractive crystal with oscillations. Dispersion relations are obtained, and the conditions for the existence of all the described types of waves are indicated depending on the optical characteristics of the crystals.

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BURGER, M. « Growth of multiple crystals in polymer melts ». European Journal of Applied Mathematics 15, n^o 3 (juin 2004) : 347–63. http://dx.doi.org/10.1017/s0956792504005522.

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The aim of this paper is to develop a theory for the growth of multiple crystals in a polymer melt. This leads to nonlinear moving boundary problems for the temperature, with normal growth speed of the crystal boundaries determined by a nonlinear Gibbs-Thompson relation. Particular attention is paid to the effect of impingement, i.e., the event of two crystals hitting each other, which stops the growth on the contact interface. In one space dimension, the well-posedness of the growth model coupled to the heat equation is shown for an arbitrary number of crystals, both in a quasi-stationary and in an instationary situation. The resulting evolution of a fixed crystal in presence of other crystals is compared to the pure single crystal case. Finally, some basic features of the model in higher spatial dimensions and the main problems encountered in the attempt to prove a general well-posedness result are discussed.

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30

Vasudevan, Paranthaman, et Devaraj Jayaraman. « Synthesis and Characterization of NLO Material L-Valine L-Valinium Perchlorate Monohydrate for Photonics Applications ». Photonics Letters of Poland 12, n^o 3 (30 septembre 2020) : 76. http://dx.doi.org/10.4302/plp.v12i3.1004.

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L-valine L-valinium perchlorate monohydrate single crystal has been synthesized by slow evaporation technique at room temperature. The crystal structure and space group of the crystal were confirmed by single crystal X-ray diffractometer. Optical behavior of the crystal was analyzed by using UV-visible spectrophotometer. Thermal stability was discussed by using thermo gravimetric analysis. Mechanical strength of the grown crystal was studied using Vickers microhardness tester. Nonlinear optical property was explored to confirm the second harmonic generation efficiency of the grown crystal. These preliminary investigations suggest that the title compound can serve as a potential material for photonics applications. Full Text: PDF ReferencesD. J. Williams, "Nonlinear Optical Properties of Organic and Polymer Materials" (ACS Symposium series 233, American Chemical Society, Washington, DC, 1983). CrossRef K. Bouchouit, Z. Sofiani, B. Derkowska, S. Abed, N. Benali-cherif, M. Bakasse and B. Sahraoui, "Investigation of crystal structure and nonlinear optical properties of 2-methoxyanilinium nitrate", Opt. Commun. 278, 180 (2007), CrossRef K. Bouchouit, H. Bougharraf, B. Derkowska-zielinska, N. Benali-cherif and B. Sahraoui, "Reversible phase transition in semi-organic compound p-Nitroanilinium sulfate detected using second harmonic generation as a tool", Opt.Mater. 48, 215 (2015), CrossRef J. H. Joshi, S. Kalainathan, M. J. Joshi and K. D. Parikh, "Crystal growth, spectroscopic, second and third order nonlinear optical spectroscopic studies of L-phenylalanine doped ammonium dihydrogen phosphate single crystals", Arab. J. Chem. 13, 5018 (2020), CrossRef A. Vijayakumar, A. Ponnuvel and A. Sasikala, "Growth and characterization of α and β form of L-histidine dihydrochloride single crystals", Mater. Today 14, 338 (2019), CrossRef C. Usha, R. Sathakuamri, Lynnette Joseph, D.Sajan, R.Meenakshi, and A.Sinthiya, "Growth and combined experimental and quantum chemical study of glycyl-L-Valine crystal", Heliyon 5, e01574 (2019), CrossRef P. Maadeshwaran and J. Chandrasekaran, "Synthesis, growth and characterization of l-valine cadmium chloride monohydrate—A novel semiorganic nonlinear optical crystal", Optik 122, 1128 (2011) CrossRef S. Pandiyaran, M. Umadevi, R. K. Rajaraman and V. K. Ramakrishnan, "Infrared and Raman spectroscopic studies of l-valine l-valinium perchlorate monohydrate", Spectrochim. Act A Mol. 62, 630 (2005) CrossRef S. Pandiarajan, B. Sridhar and R. K. Rajaram, "L-Valine L-valinium perchlorate monohydrate", Acta Crystallogr. E, 57, 0466 (2001) CrossRef M. Lydia Caroline and S. Vasudevan, "Growth and characterization of l-phenylalanine nitric acid, a new organic nonlinear optical material", Mater. Lett. 63, 41 (2009) CrossRef J. Tauc, R. Grigorovici and A. Vancu, "Optical Properties and Electronic Structure of Amorphous Germanium", Phy. Solid. Stat. 15, 627 (1966), CrossRef J. Tauc, A. Menth and D.L. Wood, "Optical and Magnetic Investigations of the Localized States in Semiconducting Glasses", Phys. Rev. Lett. 25, 749 (1970) CrossRef B. Thirumalaiselvam, R. Kanagadurai, D. Jayaraman and V. Natarajan, "Growth and characterization of 4-methyl benzene sulfonamide single crystals", Opt.Mater. 37, 74 (2014) CrossRef J. Bowman and M. Bevis, "The evaluation of the structure and hardness of processed plastics by the Vickers microhardness test", Colloid Polym. Sci. 255, 954 (1977) CrossRef S. K. Kurtz and T. T. Perry, "A Powder Technique for the Evaluation of Nonlinear Optical Materials", J. Appl. Phy. 39, 3798 (1968) CrossRef M. Prakash, D. Geetha and M. Lydia Caroline, "Crystal growth, structural, optical, spectral and thermal studies of tris(l-phenylalanine)l-phenylalaninium nitrate: A new organic nonlinear optical material", Spectrochim. Act A Mol. 81, 48 (2011) CrossRef

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Li, Chen, Changqin Ding, Minghe Li, Jiayue Rong, Hilary Florian et Garth Simpson. « Depth-of-field extension in optical imaging for rapid crystal screening ». Acta Crystallographica Section D Structural Biology 77, n^o 4 (30 mars 2021) : 463–70. http://dx.doi.org/10.1107/s2059798321000097.

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The depth of field (DoF) was extended 2.8-fold to achieve rapid crystal screening by retrofitting a custom-designed micro-retarder array (µRA) in the optical beam path of a nonlinear optical microscope. The merits of the proposed strategy for DoF enhancement were assessed in applications of second-harmonic generation imaging of protein crystals. It was found that DoF extension increased the number of crystals detected while simultaneously reducing the number of `z-slices' required for screening. Experimental measurements of the wavelength-dependence of the extended DoF were in excellent agreement with theoretical predictions. These results provide a simple and broadly applicable approach to increase the throughput of existing nonlinear optical imaging methods for protein crystal screening.

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Joseph, Arun Kuzhivelil, et S. Jayalekshmi. « Linear and Nonlinear Optical Constants of Potassium Acid Phthalate crystal ». Photonics Letters of Poland 10, n^o 3 (1 octobre 2018) : 97. http://dx.doi.org/10.4302/plp.v10i3.832.

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Single crystals of potassium hydrogen phthalate (KAP) are grown by solution growth technique. Linear optical constants are evaluated from UV/VIS/NIR spectrum. The Z scan technique is used to elucidate the third order nonlinearity in the material. The results indicate that the compound exhibits reverse saturable absorption (RSA) and self-defocusing performance. The second harmonic generation (SHG) efficiency of the crystal evaluated by Kurtz and Perry technique is compared with that of the standard KDP crystal. Attempt is made to correlate the SHG efficiency with the crystalline perfection in the material. Full Text: PDF ReferencesMiniewicz.A, Barkiewics.S, "On the electro‐optic properties of single crystals of sodium, potassium and rubidium acid phthalates", Adv.Mat.Opt.Elect,2,157(1993). CrossRef Comeretto.D, Rosy.L, "Optical properties of potassium acid phthalate", J.Mat.Res, 12, 1262(1997). CrossRef Krajewski.T, Breczewski.T, "Dielectric and pyroelectric properties of TGS crystals doped with nitroaniline molecules", Ferroelectrics, 25, 547 (1980). CrossRef N. Kejalakshmy, K. Srinivasan, "Growth, optical and electro-optical characterisations of potassium hydrogen phthalate crystals doped with Fe3+ and Cr3+ ions", Opt. Mater. 27,389–394A, (2004). [5] CrossRef Ester. G.R, Price.R, Halfpenny. P.J, "An atomic force microscopic investigation of surface degradation of potassium hydrogen phthalate (KAP) crystals caused by removal from solution", J.Cryst.Growth, 182, 95(1998). CrossRef Hiroyuki Toda, Carl M. Verber "Simple technique to reveal a slow nonlinear mechanism in a z-scanlike n2 measurement", Opt. Lett. 17(19) 1379(1992). CrossRef K.J. Arun, S.Jayalekshmi, "Investigations on the nonlinear optical properties of glycinium oxalate single crystals", Optoelectron. Lett. 7(2), 136, (2011). CrossRef K.J.Arun, S.Jayalekshmi, "Third order nonlinear optical constants of L-alaninium oxalate", Phot. Lett. Poland 7(3), 81-83 (2015) CrossRef

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Liang, Fei, Naizheng Wang, Xiaomeng Liu, Zheshuai Lin et Yicheng Wu. « Co-crystal LiCl·(H3C3N3O3) : a promising solar-blind nonlinear optical crystal with giant nonlinearity from coplanar π-conjugated groups ». Chemical Communications 55, n^o 44 (2019) : 6257–60. http://dx.doi.org/10.1039/c9cc02990g.

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Boqin Ma, Boqin Ma, Kyle Kafka Kyle Kafka et and Enam Chowdhury and Enam Chowdhury. « Fourth-harmonic generation via nonlinear diffraction in a 2D LiNbO3 nonlinear photonic crystal from mid-IR ultrashort pulses ». Chinese Optics Letters 15, n^o 5 (2017) : 051901–51905. http://dx.doi.org/10.3788/col201715.051901.

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Yudin, Nikolai, Oleg Antipov, Ilya Eranov, Alexander Gribenyukov, Galina Verozubova, Zuotao Lei, Mikhail Zinoviev et al. « Laser-Induced Damage Threshold of Single Crystal ZnGeP2 at 2.1 µm : The Effect of Crystal Lattice Quality at Various Pulse Widths and Repetition Rates ». Crystals 12, n^o 5 (2 mai 2022) : 652. http://dx.doi.org/10.3390/cryst12050652.

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The ZnGeP2 crystal is a material of choice for powerful mid-IR optical parametric oscillators and amplifiers. In this paper, we present the experimental analysis of the optical damage threshold of ZnGeP2 nonlinear crystals induced by a repetitively-pulsed Ho3+:YAG laser at 2091 nm. Two types of ZnGeP2 crystals grown under different conditions were examined using the laser and holographic techniques. The laser-induced damage threshold (LIDT) determined by the pulse fluence or peak intensity was studied as a function of the pulse repetition rate (PRR) and laser exposure duration. The main crystal structure factor for a higher LIDT was found to be a reduced dislocation density of crystal lattice. The ZnGeP2 nonlinear crystals characterized by the high structural perfection with low density of dislocations and free from twinning and stacking faults were measured to have a 3.5 J/cm2 pulse fluence damage threshold and 10.5 MW/cm2 peak intensity damage threshold at 12 kHz PRR; at 40 kHz PRR the pulse fluence damage threshold increased to over 6 J/cm2, but the peak intensity damage threshold dropped to 5.5 MW/cm2.

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Ramesh Kumar, G., et S. Gokul Raj. « Growth and PhysioChemical Properties of Second-Order Nonlinear Optical L-Threonine Single Crystals ». Advances in Materials Science and Engineering 2009 (2009) : 1–40. http://dx.doi.org/10.1155/2009/704294.

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The present aim of the paper is to grow and to study the various properties of L-threonine amino acid single crystal in various aspects. Crystal growth of L-threonine single crystals has been carried out with the help of crystallization kinetics. pH and deuteration effects on the properties of the grown crystals have been studied and the results presented in a lucid manner. The various second-order NLO parameters were evaluated using anharmonic oscillator model. Particle and ion irradiation effects on structural, optical, and surface properties of the crystals have also been studied in detail.

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Hanumantharao, Redrothu, et S. Kalainathan. « Chemical Etching, AFM, Laser Damage Threshold, and Nonlinear Optical Studies of Potential Nonlinear Optical Crystal : Bis (L-Glutamine) Potassium Nitrate ». Journal of Chemistry 2013 (2013) : 1–4. http://dx.doi.org/10.1155/2013/305932.

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A novel semiorganic nonlinear optical crystal bis (L-glutamine) potassium nitrate (BGPN) grown by slow evaporation technique at ambient temperature. The grown crystal surface has been analyzed by chemical etching and atomic force microscopy (AFM) studies. Amplitude parameters like area roughness, roughness average, valley height, valley depth, peak height, and peak valley height were measured successfully from AFM studies. Etching studies were carried out by various solvents like water, methanol and ethanol. The etching study indicates the occurrence of different types of etch pit patterns like striations and steplike pattern. The laser damage threshold energy has been measured by irradiating laser beam using a Q-switched Nd: YAG laser (1064 nm). Second harmonic generation (SHG) studies have been performed by famous Kurtz powder technique with reference to standard potassium dihydrogen phosphate single crystals (KDP). It is found from this technique that SHG efficiency of BGPN is in comparison to that of standard KDP crystals.

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Bhuvaneswari, G., L. Guru Prasad et N. Prabhavathi. « Synthesis, growth and characterization of organic crystal triphenylmethane p-nitroaniline : a nonlinear optical crystal ». Materials Science-Poland 35, n^o 3 (20 octobre 2017) : 667–72. http://dx.doi.org/10.1515/msp-2017-0068.

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AbstractA triphenylmethane-4-nitroaniline salt has been synthesized and the crystals have been grown by using slow evaporation solution growth technique. The grown single crystal was investigated by recording the powder XRD, FT-IR spectrum, UV-Vis spectrum, Vickers microhardness test, dielectric measurements and powder SHG. The growth of crystal was confirmed by analyzing the XRD pattern and it was stated that the grown material crystallized in triclinic system. Vibrational peaks of the functional groups existing in the compound were identified. Vickers microhardness studies were carried to measure the mechanical strength. In order to identify the phase transition temperature, the dielectric studies were carried out at different temperatures. Dielectric constant, dielectric loss and impedance of the crystal were monitored with respect to the frequency of electric field.

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Rajesh, K., A. Mani, V. Thayanithi et P. Praveen Kumar. « Optical, Thermal, and Mechanical Properties of L-Serine Phosphate, a Semiorganic Enhanced NLO Single Crystal ». International Journal of Optics 2016 (2016) : 1–5. http://dx.doi.org/10.1155/2016/9070714.

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Single crystals of L-serine phosphate (LSP) were grown by slow evaporation technique. The optical studies reveal the transparency of the crystal in the entire visible region. Grown crystal was subjected to single crystal XRD diffraction technique. Thermal studies of LSP confirm the thermal stability of the crystal and it is stable up to 210°C. The functional groups and optical behaviour of the crystal were identified from FT-IR and UV-Vis analysis. The crystals were also characterized by microhardness and photoconductivity to determine the mechanical strength and the optical conductivity. Laser damage threshold and nonlinear optical activity of the grown crystal were confirmed by Q-switched Nd : YAG laser beam.

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Alemu, Dessale, Idris Shafi et Tizazu Abza. « Synthesis, growth and characterization of magnesium chloride doped L-alanine cadmium chloride single crystal : For nonlinear optical application ». East African Journal of Biophysical and Computational Sciences 3, n^o 2 (24 octobre 2022) : 61–67. http://dx.doi.org/10.4314/eajbcs.v3i2.6s.

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The aim of this research was to synthesize and characterize pure and magnesium chloride (MgCl2) doped L–alanine cadmium chloride (LACC) single crystals. Pure and MgCl2 doped LACC single crystals were synthesized by solution method with slow evaporation solution growth technique at room temperature. The single crystal X-ray diﬀraction studies of pure, 1 and 2 mol% MgCl2 doped LACC single crystals revealed monoclinic crystal structure with C2 space group. The optical properties of pure and MgCl2 doped LACC single crystals investigated by UV–VIS/NIR spectrometer confirmed that the crystals were transparent in the wavelength range of 230-1100 nm. The optical band gap energy of pure and doped LACC single crystals were found to have the same value of 5.4 eV. The energy-dispersive X-ray analysis indicated the incorporation of magnesium and chlorine atoms in LACC single crystal. The second harmonic generation eﬃciency of 1 and 2 mol% MgCl2 doped LACC crystals were analyzed by Kurtz-Perry powder technique and found to be 1.75 and 2 times greater than that of the standard potassium dihydrogen phosphate crystal, respectively.

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Chen, Chuangtian, Yicheng Wu, Aidong Jiang, Bochang Wu, Guiming You, Rukang Li et Shujie Lin. « New nonlinear-optical crystal : LiB_3O_5 ». Journal of the Optical Society of America B 6, n^o 4 (1 avril 1989) : 616. http://dx.doi.org/10.1364/josab.6.000616.

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Bankov, S. E. « Semi-infinite nonlinear electromagnetic crystal ». Journal of Communications Technology and Electronics 56, n^o 6 (juin 2011) : 613–23. http://dx.doi.org/10.1134/s1064226911050032.

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Ivanova, S. V. « Nanodomain structures in nonlinear crystal ». Ferroelectrics 539, n^o 1 (25 janvier 2019) : 9–15. http://dx.doi.org/10.1080/00150193.2019.1570005.

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Zhang, Jianxiu, Shufeng Zhang, Yicheng Wu et Jiyang Wang. « New Nonlinear Optical Crystal : NaBa4Al2B8O18Cl3 ». Inorganic Chemistry 51, n^o 12 (4 juin 2012) : 6682–86. http://dx.doi.org/10.1021/ic300306v.

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Ye, Ning, Wenrong Zeng, Jie Jiang, Baichang Wu, Chuangtian Chen, Baohua Feng et Xiulan Zhang. « New nonlinear optical crystal K_2Al_2B_2O_7 ». Journal of the Optical Society of America B 17, n^o 5 (1 mai 2000) : 764. http://dx.doi.org/10.1364/josab.17.000764.

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Huang, Hongwei, Chuangtian Chen, Xiaoyang Wang, Yong Zhu, Guiling Wang, Xin Zhang, Lirong Wang et Jiyong Yao. « Ultraviolet nonlinear optical crystal : CsBe_2BO_3F_2 ». Journal of the Optical Society of America B 28, n^o 9 (16 août 2011) : 2186. http://dx.doi.org/10.1364/josab.28.002186.

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Malov, Yu A. « Heterostructure as a nonlinear crystal ». Physics Letters A 161, n^o 4 (janvier 1992) : 378–80. http://dx.doi.org/10.1016/0375-9601(92)90565-4.

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LIN, HUI-CHI, et ANDY YING-GUEY FUH. « Z-SCAN MEASUREMENTS OF OPTICAL NONLINEARITIES OF DYE-DOPED LIQUID CRYSTALS ». Journal of Nonlinear Optical Physics & ; Materials 18, n^o 03 (septembre 2009) : 367–400. http://dx.doi.org/10.1142/s0218863509004671.

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Nematic liquid crystal (NLC) is a material that features a large nonlinear optical response. The nonlinearity can be enhanced by doping a dye agent into a NLC host. In this paper, we review the nonlinear phenomena recently observed for dye-doped liquid crystal (DDLC) films measured using the Z-scan technique, which is a simple, yet powerful method for measuring nonlinear refractive indices (optical Kerr constant) n2 and nonlinear absorption coefficients β. The nonlinear effects of liquid crystals (LCs) include the electronic polarization effect, electrostriction effect, thermal effect and reorientation effect. When LCs are doped with dye agents, the dye-induced orientational effect, photoisomerization effect, and light-induced thermal effect come about to enhance LC nonlinearity. The dominant effect depends strongly upon the spatial, temporal and polarization properties of the excitation laser beam. Generally speaking, the nonlinear effects resulted from the electronic polarization and photoisomerization effects arise from a laser pulse on picosecond duration scale, while electrostriction, thermal and reorientation effects occur on nanosecond ~ microsecond, nanosecond ~ millisecond and millisecond ~ second duration scales, respectively. In this paper, the causation of nonlinear refractive index n2 into various different experimental conditions is summarized, including the changes of the external electric field, external optical field, polarization of pump beam, temperature and the use of deuterated materials. The mechanisms, which influence the nonlinear effect in dye-doped liquid crystal films, are also discussed.

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ARIPONNAMMAL, S., R. SELVA VENNILA, S. RADHIKA et P. M. USHASREE. « HIGH PRESSURE ELECTRICAL RESISTIVITY STUDY ON NONLINEAR SINGLE CRYSTAL ZINC THIOUREA CHLORIDE ». Modern Physics Letters B 21, n^o 11 (10 mai 2007) : 675–78. http://dx.doi.org/10.1142/s0217984907012918.

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Zinc thiourea chloride (ZTC) crystals were crystallized by slow evaporation technique. The lattice parameters of the grown crystals were determined by angle dispersive X-ray powder diffraction technique (XRD) and the structure was confirmed. High pressure electrical resistivity study was carried out on this crystal and the results are reported here.

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Saravanan, M. « Growth and characterization of efficient second-order nonlinear optical material : N-(2-chlorophenyl)-(1-propanamide) ». Journal of Nonlinear Optical Physics & ; Materials 29, n^o 01n02 (mars 2020) : 2050001. http://dx.doi.org/10.1142/s0218863520500010.

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The crystals N-(2-chlorophenyl)-(1-propanamide) (NCP) appropriate for nonlinear optical (NLO) and electro–optic appliances were grown full-fledged by the slow cooling method. The solubility and metastable zone width range of NCP specimen were studied. The specimen crystallizes in the monoclinic crystal system with noncentrosymmetric space group of P21. The crystal morphology study also elucidates supplementary excellence of the as-grown NCP crystal. The optical precision in the whole visible region was found to be superior for NLO claim. The crystallinity of the full-fledged crystal is determined by etching and HRXRD. Laser harm threshold and photoluminescence studies delegate the grown crystal comprises extremely less imperfections. The mechanical deeds of NCP sample at assorted temperatures were examined to decide the hardness solidity of the grown specimen. The piezoelectric behavior and the comparative second harmonic generation for assorted particle sizes of the material were also deliberate. The third-order nonlinear ocular possessions of NCP crystal specimen were determined by Z-scan method. The optical homogeneity of the solitary crystal was assessed using customized channel spectrum technique. The thermal structures of NCP solitary crystal have been studied using photopyroelectric method. The half-wave voltage of the full-fledged crystal was intended from the electro–optic experimentation. Photoconductivity nature of the grown crystal outlined consummate inducing dipoles due to strong incident radiation and further revealed the nonlinear deeds of the grown material.

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