Relevant bibliographies by topics / Raman linewidth

Academic literature on the topic 'Raman linewidth'

Author: Grafiati
Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Raman linewidth"

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Wang, Liangyu, Hong Li, Jie Zheng, and Ling Li. "Extremely Ultranarrow Linewidth Based on Low-Symmetry Al Nanoellipse Metasurface." Nanomaterials 13, no. 1 (December 24, 2022): 92. http://dx.doi.org/10.3390/nano13010092.

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Plasmonic nanostructures with ultranarrow linewidths are of great significance in numerous applications, such as optical sensing, surface-enhanced Raman scattering (SERS), and imaging. The traditional plasmonic nanostructures generally consist of gold and silver materials, which are unavailable in the ultraviolet (UV) or deep-ultraviolet (DUV) regions. However, electronic absorption bands of many important biomolecules are mostly located in the UV or DUV regions. Therefore, researchers are eager to realize ultranarrow linewidth of plasmonic nanostructures in these regions. Aluminum (Al) plasmonic nanostructures are potential candidates for realizing the ultranarrow linewidth from the DUV to the near-infrared (NIR) regions. Nevertheless, realizing ultranarrow linewidth below 5 nm remains a challenge in the UV or DUV regions for Al plasmonic nanostructures. In this study, we theoretically designed low-symmetry an Al nanoellipse metasurface on the Al substrate. An ultranarrow linewidth of 1.9 nm has been successfully obtained in the near-UV region (400 nm). Additionally, the ultranarrow linewidth has been successfully modulated to the DUV region by adjusting structural parameters. This work aims to provide a theoretical basis and prediction for the applications, such as UV sensing and UV-SERS.
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Tian, Xin, Chenhui Gao, Chongwei Wang, Xiaofan Zhao, Meng Wang, Xiaoming Xi, and Zefeng Wang. "2.58 kW Narrow Linewidth Fiber Laser Based on a Compact Structure with a Chirped and Tilted Fiber Bragg Grating for Raman Suppression." Photonics 8, no. 12 (November 25, 2021): 532. http://dx.doi.org/10.3390/photonics8120532.

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We report a high power, narrow linewidth fiber laser based on oscillator one-stage power amplification configuration. A fiber oscillator with a center wavelength of 1080 nm is used as the seed, which is based on a high reflection fiber Bragg grating (FBG) and an output coupling FBG of narrow reflection bandwidth. The amplifier stage adopted counter pumping. By optimizing the seed and amplifier properties, an output laser power of 2276 W was obtained with a slope efficiency of 80.3%, a 3 dB linewidth of 0.54 nm and a signal to Raman ratio of 32 dB, however, the transverse mode instability (TMI) began to occur. For further increasing the laser power, a high-power chirped and tilted FBG (CTFBG) was inserted between the backward combiner and the output passive fiber, experimental results showed that both the threshold of Stimulated Raman scattering (SRS) and TMI increased. The maximum laser power was improved to 2576 W with a signal to Raman ratio of 42 dB, a slope efficiency of 77.1%, and a 3 dB linewidth of 0.87 nm. No TMI was observed and the beam quality factor M2 maintained about 1.6. This work could provide a useful reference for obtaining narrow-linewidth high-power fiber lasers with high signal to Raman ratio.
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TADA, K., A. YAMANAKA, and N. KARASAWA. "BROADBAND COHERENT ANTI-STOKES RAMAN SCATTERING MICROSPECTROSCOPY USING THE SOLITON PULSES FROM A PHOTONIC CRYSTAL FIBER — OBSERVATION OF RAMAN LINE IN DIAMOND POWDERS." Journal of Nonlinear Optical Physics & Materials 19, no. 04 (December 2010): 723–28. http://dx.doi.org/10.1142/s0218863510005649.

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We have investigated broadband coherent anti-Stokes Raman scattering (CARS) microspectroscopy using the soliton pulses from a photonic crystal fiber. CARS spectrum shows a dispersive shape due to the contributions from a frequency-independent nonresonant component and from a resonant component that corresponds to spontaneous Raman scattering. To extract the resonant component from the CARS spectrum, the functional form of this component was commonly assumed to be a simple Lorentzian function and a nonlinear fitting procedure was used previously. In this study, we derived a CARS spectral function that takes into account the finite spectral width of a pump pulse and the CARS spectrum of diamond powders was fitted using the derived spectral function. It was found that the linewidth obtained using this function agreed with the linewidth of spontaneous Raman scattering much better than the linewidth obtained using a CARS spectral function commonly used previously.
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Bouteiller, J. C. "Linewidth predictions for Raman fibre lasers." Electronics Letters 39, no. 21 (2003): 1511. http://dx.doi.org/10.1049/el:20030980.

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Verma, A. K., D. M. Gaitonde, R. S. Rao, and B. K. Godwal. "Phonon Raman linewidth in correlated metals." Physica B: Condensed Matter 353, no. 3-4 (December 2004): 201–4. http://dx.doi.org/10.1016/j.physb.2004.09.094.

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Feng, Yan, Luke Taylor, and Domenico Bonaccini Calia. "Multiwatts narrow linewidth fiber Raman amplifiers." Optics Express 16, no. 15 (July 8, 2008): 10927. http://dx.doi.org/10.1364/oe.16.010927.

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Shen, Chencheng, Xianglong Cai, Xinjun Su, Tiancheng Zheng, Jinbo Liu, Ying Chen, Yuxi Jia, Dong Liu, and Jingwei Guo. "Wavelength-tunable narrow-linewidth gaseous Raman laser." Applied Optics 60, no. 18 (June 18, 2021): 5465. http://dx.doi.org/10.1364/ao.424400.

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Debernardi, A., C. Ulrich, M. Cardona, and K. Syassen. "Pressure Dependence of Raman Linewidth in Semiconductors." physica status solidi (b) 223, no. 1 (January 2001): 213–23. http://dx.doi.org/10.1002/1521-3951(200101)223:1<213::aid-pssb213>3.0.co;2-i.

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Puech, Kandara, Paredes, Moulin, Weiss-Hortala, Kundu, Ratel-Ramond, Plewa, Pellenq, and Monthioux. "Analyzing the Raman Spectra of Graphenic Carbon Materials from Kerogens to Nanotubes: What Type of Information Can Be Extracted from Defect Bands?" C — Journal of Carbon Research 5, no. 4 (November 1, 2019): 69. http://dx.doi.org/10.3390/c5040069.

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Considering typical spectra of a broad range of carbonaceous materials from gas-shale to nanotubes, various ways by which defects show up in Raman spectra are exampled and discussed. The position, resonance behavior, and linewidth of both the D and G bands are compared, even if in some cases obtaining accurate information on the materials from the fitting parameters is a difficult task. As a matter of fact, even if a full picture is unreachable, defining parameter trends is one acceptable option. Two ways to determine the linewidth, either graphically and or by fitting are proposed in order to be able to compare literature data. The relationship between the crystallite size obtained from the linewidth and from X-ray diffraction, which is complementary to the Tuinstra and Koenig law, is examined. We show that a single approach is not possible unless modeling is performed and therefore that analysis of Raman spectra should be adapted to the specificities of each sample series, i.e., a minimum of knowledge about the materials is always required.
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Song, Jiaxin, Pengfei Ma, Shuai Ren, Song Zhang, Wei Liu, Hu Xiao, Hanwei Zhang, and Pu Zhou. "2 kW narrow-linewidth Yb-Raman fiber amplifier." Optics Letters 46, no. 10 (May 6, 2021): 2404. http://dx.doi.org/10.1364/ol.425714.

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Dissertations / Theses on the topic "Raman linewidth"

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Zhou, Renjie. "Developments of Narrow-Linewidth Q-switched Fiber Laser, 1480 nm Raman Fiber Laser, and Free Space Fiber Amplifier." Thesis, The University of Arizona, 2011. http://hdl.handle.net/10150/202931.

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In the first chapter, a Q-switched fiber laser that is capable of generating transform-limited pulses based on single-frequency fiber laser seeded ring cavity is demonstrated. The output pulse width can be tuned from hundreds of nanoseconds to several microseconds. This Q-switched ring cavity fiber laser can operate over the whole C-band. In addition, a theoretical model is developed to numerically study the pulse characteristics, and the numerical results are in good agreements with the experimental results. In the next chapter, a Raman fiber laser is developed for generating signal at 1480 nm. Initial experimental results has demonstrated generating of Raman laser at 1175 nm, 1240 nm, 1315 nm, and 1395 nm wavelength. Finally, a free space fiber amplifier is studied both theoretically and experimentally. The experimental work has demonstrated signal coupling efficiency up to 90% in the NP highly Er/Yb co-doped phosphate fiber.
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Adithya, Lakshmanna Y. "Ultrafast Raman Loss Spectroscopy (URLS) : Understanding Resonant Excitation Response And Linewidth Changes." Thesis, 2012. http://etd.iisc.ernet.in/handle/2005/2505.

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Raman spectroscopy involves change in the polarizability of the molecular system on excitation and is based on scattering process. Spontaneous Raman scattering is a two photon process, in which the input light initiates the excitation, which then leads to an emission of another photon due to scattering. It is extensively used to understand molecular properties. As spontaneous Raman scattering is a weak process, the detection of these weak Raman photons are rather difficult. Alternatively, resonance Raman (RR) scattering is another technique where the excitation wavelength is chosen according to the material under study. The excitation wavelength is chosen to be within the absorption spectrum of the material under study. RR spectroscopy not only provides considerable improvement in the intensity of the Raman signal, but also provides mode specific information i.e. the modes which are Franck-Condon active in that transition can be observed. There are reports on RR studies of many systems using pulsed light as an excitation source. It is necessary to use at least two pulsed laser sources for carrying out the time resolved RR spectroscopy. A single pulse source for excitation would lead to compromise either with temporal or spectral resolution which is due to the uncertainty principle. If an excitation pulse has pulse width of ~100 femtoseconds then the spectral resolution will be ~ 150 cm-1. It is clear now that for improving the temporal and spectral resolution simultaneously, usage of single pulse for Raman experiments (spontaneous scattering) is not adequate. The usage of multiple laser pulses may provide the way out to improve the resolutions. Nonlinear spectroscopy in a broad view helps in understanding the structural and dynamical properties of the molecular systems in a deeper manner. There are a number of techniques as a part of nonlinear spectroscopy that have emerged in due course to meet different requirements and to overcome some difficulties while understanding the molecular properties. Stimulated Raman (SRS) gain, coherent anti-Stokes Raman scattering (CARS) and the inverse Raman spectroscopy are a few to mention as third order nonlinear spectroscopic techniques which give the similar kind of information about the molecular systems. Stimulated Raman scattering is a more general process involved in nonlinear Raman processes. SRS involves at least two laser pulses and the difference in their frequencies should match with the vibrational frequency of the molecule. The polarization has to be matched between the Raman pump and the Raman probe pulses. We have developed a new nonlinear Raman technique in our laboratory named as ultrafast Raman loss spectroscopy (URLS) using the principles of nonlinear Raman scattering. It involves the Raman pump (~ 1 picosecond (ps) or ~ 15 cm-1spectral resolution) and Raman probe as a white light continuum (100 fs) whose frequency components ranges from 400-900 nm. The laser system consists of Tsunami which is pumped by a Millennia laser and Spitfire-Pro, a regenerative amplifier which is pumped by an Empower laser. Tsunami provides a 100 fs, 780 nm centered, 80 MHz and ~6 nJ energy laser pulses. The Tsunami output is fed into Spitfire to amplify its energy and change the repetition rate to 1 KHz. The pulse length of the input pulse is preserved in amplification. The output of amplifier is split into two equal parts; one part is used to pump the Optical Parametric Amplifier (OPA) in order to generate wavelengths in the range 480-800 nm. The output of the OPA is utilized to generate Raman pump which has to be in ps in order to get the best spectral resolution. A small portion of the other part of amplifier output is utilized to generate white light source for the Raman probe. The remaining part of the amplifier output is used to pump TOPAS to generate wavelengths in the ultraviolet region. URLS has been applied to many molecular systems which range from non-fluorescent to highly fluorescent. URLS has been demonstrated to be very sensitive and useful while dealing with highly fluorescent systems. URLS is a unique technique due to its high sensitivity and the Raman loss signal intensity is at least 1.5-2 times higher as compared to the Raman gain signal intensities. Cresyl violet perchlorate (CVP) is a highly fluorescent system. URLS has been applied to study CVP even at resonance excitation. Rhodamine B has also been studied using URLS. Spontaneous Raman scattering is very difficult to observe experimentally in such high quantum yield fluorescent systems. The variation in the lineshapes of the Raman bands for different RP excitation wavelengths in URLS spectra shows the mode dependent behavior of the absorption spectrum. The experimental observation of variation in the lineshape has been accounted using theoretical formalism. The thesis is focused on discussing the development of the new nonlinear Raman spectroscopic technique URLS in detail and its applicability to molecular systems for better understanding. A theoretical formalism for accounting the uniqueness of URLS among the other nonlinear Raman techniques is developed and discussed in various pictorial representations i.e. ladder, Feynman and closed loop diagrams. A brief overview of nonlinear spectroscopy and nonlinear Raman spectroscopy is presented for demonstrating the difference between the URLS and the other nonlinear Raman techniques.
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Books on the topic "Raman linewidth"

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Stopford, P. J. Molecular Scattering Calculation of Raman Spectroscopic Linewidths. AEA Technology Plc, 1988.

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Book chapters on the topic "Raman linewidth"

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Jordan, M., H. Däufer, and H. J. Jodl. "Pressure Dependence of Raman Linewidths of Molecular Crystals." In NATO ASI Series, 161–69. Boston, MA: Springer US, 1991. http://dx.doi.org/10.1007/978-1-4899-2480-3_14.

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Conference papers on the topic "Raman linewidth"

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Behzadi, Behsan, Mani Hossein-Zadeh, and Ravinder K. Jain. "Narrow-Linewidth Mid-Infrared Raman Fiber Lasers." In Nonlinear Optics. Washington, D.C.: OSA, 2017. http://dx.doi.org/10.1364/nlo.2017.ntu3a.5.

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Lux, O., R. J. Williams, S. Sarang, H. Jasbeer, A. McKay, O. Kitzler, and R. P. Mildren. "High-brightness and narrow-linewidth diamond Raman lasers." In XXI International Symposium on High Power Laser Systems and Applications, edited by Dieter Schuoecker, Richard Majer, and Julia Brunnbauer. SPIE, 2017. http://dx.doi.org/10.1117/12.2261684.

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Wang, L. L., and L. M. Yang. "Linewidth Limitations of low noise, wavelength stabilized Raman pumps." In Optical Amplifiers and Their Applications. Washington, D.C.: OSA, 2002. http://dx.doi.org/10.1364/oaa.2002.omb5.

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Distler, Victor, Friedrich Möller, Maximilian Strecker, Gonzalo Palma-Vega, Till Walbaum, Thomas Schreiber, and Andreas Tünnermann. "High power narrow-linewidth Raman amplifier and its limitation." In Fiber Lasers XVII: Technology and Systems, edited by Liang Dong and Michalis N. Zervas. SPIE, 2020. http://dx.doi.org/10.1117/12.2544622.

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Soskind, Michael, Paweł Kaczmarek, Krzysztof Abramski, and Gerard Wysocki. "Laser Source Power Enhancement for Remote Methane Sensing Applications." In Laser Applications to Chemical, Security and Environmental Analysis. Washington, D.C.: Optica Publishing Group, 2022. http://dx.doi.org/10.1364/lacsea.2022.lm3b.1.

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We present on methods for enhancing the output power of narrow-linewidth laser sources for use in applications such as methane sensing at 1650 nm using Raman amplifiers, semiconductor optical amplifiers, and coherent beam combining.
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Nordström, E., A. Hosseinnia, C. Brackmann, J. Bood, and P. E. Bengtsson. "Single-shot Raman linewidth measurements using time-resolved rotational CARS." In 3D Image Acquisition and Display: Technology, Perception and Applications. Washington, D.C.: OSA, 2016. http://dx.doi.org/10.1364/3d.2016.jt3a.24.

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Alharbi, Meshaal O., Anton Husakou, and Fetah Benabid. "Sub-natural Raman linewidth and high power CW Raman-Stokes laser in hydrogen filled HC-PCF." In Quantum Electronics and Laser Science Conference. Washington, D.C.: OSA, 2011. http://dx.doi.org/10.1364/qels.2011.qths4.

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Bespalov, V. G. "Stimulated Raman scattering spectra: quantum fluctuations and time evolution of linewidth." In 17th Congress of the International Commission for Optics: Optics for Science and New Technology. SPIE, 1996. http://dx.doi.org/10.1117/12.2316125.

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Gu, Bo, Yubin Chen, Zefeng Wang, Fei Yu, and Chaofan Zhang. "High Peak-Power Narrow Linewidth 1.9 μm Fiber Gas Raman Source." In Advanced Solid State Lasers. Washington, D.C.: OSA, 2016. http://dx.doi.org/10.1364/assl.2016.jth2a.28.

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Granados, Eduardo, Daniel T. Echarri, Katerina Chrysalidis, Valentin N. Fedosseev, Vaila A. Leask, Bruce A. Marsh, Shane G. Wilkins, Santiago M. Olaizola, Richard P. Mildren, and David J. Spence. "Spectral and polarization effects in cascaded narrow linewidth diamond Raman lasers." In Advanced Solid State Lasers. Washington, D.C.: OSA, 2020. http://dx.doi.org/10.1364/assl.2020.atu2a.5.

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