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Journal articles on the topic 'Raman linewidth'

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Author: Grafiati

Published: 10 December 2022

Last updated: 28 January 2023

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1

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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2

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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3

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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4

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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5

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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6

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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7

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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8

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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9

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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10

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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11

Xu Jiangming, 许将明, 冷进勇 Leng Jinyong, 吴武明 Wu Wuming, 周朴 Zhou Pu, and 侯静 Hou Jing. "Dual-longitudinal-modes narrow-linewidth fiber Raman amplifier." High Power Laser and Particle Beams 23, no. 7 (2011): 1705–6. http://dx.doi.org/10.3788/hplpb20112307.1705.

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12

Saltonstall, Christopher B., Thomas E. Beechem, Jatin Amatya, Jerrold Floro, Pamela M. Norris, and Patrick E. Hopkins. "Uncertainty in linewidth quantification of overlapping Raman bands." Review of Scientific Instruments 90, no. 1 (January 2019): 013111. http://dx.doi.org/10.1063/1.5064804.

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13

Lu, Tao, Lan Yang, Tal Carmon, and Bumki Min. "A Narrow-Linewidth On-Chip Toroid Raman Laser." IEEE Journal of Quantum Electronics 47, no. 3 (March 2011): 320–26. http://dx.doi.org/10.1109/jqe.2010.2087742.

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14

MacPherson, D. C., R. C. Swanson, and J. L. Carlsten. "Quantum Fluctuations in the Stimulated-Raman-Scattering Linewidth." Physical Review Letters 61, no. 1 (July 4, 1988): 66–69. http://dx.doi.org/10.1103/physrevlett.61.66.

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15

Amorim da Costa, A. M. "Raman linewidth study of molecular motion in triethylenediamine." Journal of Molecular Structure 141 (March 1986): 347–52. http://dx.doi.org/10.1016/0022-2860(86)80346-5.

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16

Liu, Zhaojun, Han Rao, Zhenhua Cong, Feng Xue, Xibao Gao, Shang Wang, Wei Tan, Chen Guan, and Xingyu Zhang. "Single-Frequency BaWO4 Raman MOPA at 1178 nm with 100-ns Pulse Pump." Crystals 9, no. 4 (April 1, 2019): 185. http://dx.doi.org/10.3390/cryst9040185.

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A single-frequency crystalline Raman master oscillator power amplifier (MOPA) at 1178 nm was demonstrated. The pump source was a homemade single-frequency 1062 nm Nd:GGG MOPA system with a pulse width of 104 ns. The BaWO4 Raman oscillator generated seed radiation at 1178 nm with a pulse energy of 7.7 mJ. The highest amplified Raman pulse energy of 41.0 mJ was obtained with a pulse width of 44.1 ns. The linewidth was less than 500 MHz.

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17

Abel, Mark R., Samuel Graham, Justin R. Serrano, Sean P. Kearney, and Leslie M. Phinney. "Raman Thermometry of Polysilicon Microelectro-mechanical Systems in the Presence of an Evolving Stress." Journal of Heat Transfer 129, no. 3 (May 31, 2006): 329–34. http://dx.doi.org/10.1115/1.2409996.

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In this work, the use of Raman Stokes peak location and linewidth broadening methods were evaluated for thermometry applications of polysilicon microheaters subjected to evolving thermal stresses. Calibrations were performed using the temperature dependence of each spectral characteristic separately, and the uncertainty of each method quantified. It was determined that the Stokes linewidth was independent of stress variation allowing for temperature determination, irrespective of stress state. However, the linewidth method is subject to greater uncertainty than the Stokes shift determination. The uncertainties for each method are observed to decrease with decreasing temperature and increasing integration times. The techniques were applied to mechanically constrained electrically active polysilicon microheaters. Results revealed temperatures in excess of 500°C could be achieved in these devices. Using the peak location method resulted in an underprediction of temperature due to the development of a relative compressive thermal stress with increasing power dissipation.

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18

ZHANG, X. K., HUA XIA, AN HU, M. S. ZHANG, X. Y. YUAN, QIANG CHEN, and S. N. ZHU. "RAMAN SCATTERING ON PHONONS IN Nb-Cu METALLIC SUPERLATTICE." Modern Physics Letters B 03, no. 05 (April 10, 1989): 381–86. http://dx.doi.org/10.1142/s0217984989000613.

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We present Raman scattering results on transverse acoustic phonons in metallic superlattice and have verified most expectations regarding acoustic phonon folding as in semiconductor superlattices. Raman folded peaks up to seventh order can be observed which agree closely with elastic continuum prediction in frequency. Owing to metal high optical absorption, phonon momentum nonconserving have caused increasing linewidth and disorder-activated transverse-acoustic mode scattering.

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19

Vickers, Thomas J., Charles K. Mann, Chan Kong Chong, and Jianxiong Zhu. "Wavelength Stability with an Injection-Locked Excimer Laser." Applied Spectroscopy 43, no. 8 (November 1989): 1368–70. http://dx.doi.org/10.1366/0003702894204281.

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Linewidth and wavelength measurements have been made on the emission from an injection-locked KrF laser to address questions which have been raised about the suitability of this device for UV resonance Raman measurements. To the extent that any wavelength jitter occurs, it is less than 0.004 Å. We conclude that the KrF excimer laser is a relatively robust source of UV radiation for Raman measurements.

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20

Liu, Kun, Ji Sheng Yang, Rui Li, Wei Peng, and Shi Pan. "The Structural Characteristics of CIS Thin Films Prepared by Electro-Deposited Method." Advanced Materials Research 818 (September 2013): 88–91. http://dx.doi.org/10.4028/www.scientific.net/amr.818.88.

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The properties of the absorber layer of solar cell CuInSe2(CIS) thin film made by electro-depostied method were researched in this article. Different concentration of reactant and voltage was applied to prepare the CIS film. The micro-Raman spectroscopy and X-ray diffraction (XRD) of CIS film was carried out. A correlation between the linewidth A1 mode of Raman spectrum and the XRD line and the voltage of electro-deposition technology was found.

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21

Salis, M., P. C. Ricci, and A. Anedda. "Effective Linewidth in Raman Spectra of Titanium Dioxide Nanocrystals." Open Condensed Matter Physics Journal 2 (April 28, 2009): 15–18. http://dx.doi.org/10.2174/1874186x00902010015.

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22

Qian, Lipeng, Sohail H. Zaidi, and Richard Miles. "Narrow-Linewidth Ultraviolet Source for Rayleigh and Raman Applications." AIAA Journal 43, no. 3 (March 2005): 451–57. http://dx.doi.org/10.2514/1.9363.

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23

Finkelstein, N. D., W. R. Lempert, and R. B. Miles. "Narrow-linewidth passband filter for ultraviolet rotational Raman imaging." Optics Letters 22, no. 8 (April 15, 1997): 537. http://dx.doi.org/10.1364/ol.22.000537.

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24

Sheng, Quan, Hanchao Ma, Ran Li, Meng Wang, Wei Shi, and Jianquan Yao. "Recent progress on narrow-linewidth crystalline bulk Raman lasers." Results in Physics 17 (June 2020): 103073. http://dx.doi.org/10.1016/j.rinp.2020.103073.

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25

Aksenov, V. L., and V. V. Kabanov. "Electron-phonon interaction and Raman linewidth in superconducting fullerides." Physical Review B 57, no. 1 (January 1, 1998): 608–12. http://dx.doi.org/10.1103/physrevb.57.608.

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26

Swanson, R. C., P. R. Battle, and J. L. Carlsten. "Quantum statistics of the gain-narrowed Raman linewidth inH2." Physical Review A 42, no. 11 (December 1, 1990): 6774–83. http://dx.doi.org/10.1103/physreva.42.6774.

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27

Börjesson, L., and L. M. Torell. "Reorientational motion in superionic sulfates: A Raman linewidth study." Physical Review B 32, no. 4 (August 15, 1985): 2471–77. http://dx.doi.org/10.1103/physrevb.32.2471.

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28

Hölzer, Jonas I., Christian Meißner, and Thomas Seeger. "Oxygen rotational Raman linewidth determination considering nonmonoexponential decoherence behavior." Journal of Raman Spectroscopy 50, no. 9 (July 18, 2019): 1260–67. http://dx.doi.org/10.1002/jrs.5672.

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29

Tian, Xin, Binyu Rao, Meng Wang, Xiaoming Xi, Chongwei Wang, and Zefeng Wang. "4 kW narrow-linewidth fiber laser based on a simple one-stage MOPA structure." Laser Physics Letters 19, no. 11 (October 10, 2022): 115101. http://dx.doi.org/10.1088/1612-202x/ac9678.

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Abstract One-stage master oscillator power amplification (MOPA) structure is a simple and robust way to acquire high-power narrow-linewidth fiber lasers (NLFLs), which have wide applications in spectral/coherent beam combination. In this work, an NLFL system was established based on a home-made fiber oscillator seed. By using this one-stage MOPA system, a 4 kW output power was achieved with 3 dB linewidth of about 0.53 nm and optical-to-optical conversion efficiency of 76.9%. The signal to Raman ratio was ∼22 dB. The measured beam quality (M2 factor) was about 1.6 at the output power of 3780 W then degraded to 2.8 at the maximum power of 4 kW. To the best of our knowledge, the 4 kW is the highest output power for such narrow linewidth one-stage MOPA fiber lasers.

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30

LEE, HYEON-KEUN, and DO KYUNG KIM. "DEFECT CHARACTERIZATION OF HIGH THERMAL CONDUCTIVITY CaF2 DOPED AlN CERAMICS BY RAMAN SPECTROSCOPY." Modern Physics Letters B 23, no. 31n32 (December 30, 2009): 3869–76. http://dx.doi.org/10.1142/s0217984909021934.

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Calcium fluoride additive was used to produce high thermal conductivity AlN ceramics which has no grain boundary phase. Thermal conductivity of AlN is determined by the point defect, represented as oxygen related defect, within the AlN grain. The defect density characterization of high thermal conductivity CaF 2 doped AlN ceramics after heat treatment was conducted by Raman spectroscopy. As measure Raman linewidth broadening, the point defect density variation after heat treatment and corresponding thermal conductivity change was investigated.

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31

Krause, Michael, and Hagen Renner. "Numerical calculation of the linewidth of Raman fiber lasers due to spontaneous Raman scattering." AEU - International Journal of Electronics and Communications 59, no. 8 (December 2005): 502–9. http://dx.doi.org/10.1016/j.aeue.2005.02.006.

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32

Ulness, Darin J., Michael J. Stimson, Jason C. Kirkwood, and A. C. Albrecht. "Time-Frequency Resolved Coherent Raman Scattering From Molecular Liquids and Their Mixtures With Quasi-Cw Noisy Light: I(2) CRS Spectrograms." Laser Chemistry 19, no. 1-4 (January 1, 1999): 11–18. http://dx.doi.org/10.1155/1999/37509.

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It is demonstrated how time-frequency resolved coherent Raman scattering (CRS) signals generated by broadband, non-transform limited, quasi-cw (noisy) light can be sensitive probes of molecular vibrational dynamics. The coherent Raman scattering signals from molecular liquids and their mixtures with noisy light are dispersed onto a CCD array and probed interferometrically to produce time-frequency domain spectrograms. These spectrograms offer an extensive oversampling of the data resulting in improved precision of measured parameters over previous noisy light methods. This technique has been very useful in measuring small changes in material parameters, such as Raman frequency shifts and linewidth changes, in dilution series with Raman inactive diluents. Very recently theory and experiment have extended to include mixtures with multiple Raman resonances. Several examples of experiments are presented and discussed.

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33

Wasyluk, Joanna, Tatiana S. Perova, Sergey A. Kukushkin, Andrey V. Osipov, Nikolay A. Feoktistov, and Sergey A. Grudinkin. "Raman Investigation of Different Polytypes in SiC Thin Films Grown by Solid-Gas Phase Epitaxy on Si (111) and 6H-SiC Substrates." Materials Science Forum 645-648 (April 2010): 359–62. http://dx.doi.org/10.4028/www.scientific.net/msf.645-648.359.

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Raman spectroscopy was applied to investigate a series of SiC films grown on Si and 6H-SiC substrates by a new method of solid gas phase epitaxy. During the growth characteristic voids are formed in Si at the SiC/Si interface. Raman peak position, intensity and linewidth were used to characterize the quality and the polytype structure of the SiC layers. A large enhancement in the peak intensity of the transverse optical and longitudinal optical phonon modes of SiC is observed for the Raman signal measured at the voids. In addition, scanning electron microscopy and atomic force microscopy were used to investigate the surface morphology of SiC layers.

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34

Gu, Quan, Qilai Zhao, Changsheng Yang, Kui Jiang, Xianchao Guan, Chun Zeng, Wanpeng Jiang, et al. "2.02 kW and 4.7 GHz linewidth near-diffraction-limited all-fiber MOPA laser." Applied Physics Express 15, no. 3 (February 11, 2022): 032001. http://dx.doi.org/10.35848/1882-0786/ac4fab.

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Abstract Based on a low time-domain-instability narrow-linewidth seed and a counter-pumped power-amplifier with a 20/400 μm core/inner-cladding-diameter active fiber, an all-fiber 2.02 kW and 4.7 GHz linewidth near-diffraction-limited master-oscillator power-amplifier (MOPA) laser at 1064 nm is demonstrated experimentally. By decreasing the time-domain-instability of the signal, the stimulated Raman scattering effect in the power-amplifier stage is suppressed effectively. As a result, a measured M2 factor of 1.20, and an optical signal-to-noise ratio of >65 dB are obtained at the maximum output power without observation of the transverse mode instability effect. The further enhancement of power scaling of this MOPA laser is restricted by the stimulated Brillouin scattering effect. To the best of our knowledge, this result exhibits the highest output power of all-fiber MOPA laser with narrow linewidth (<5 GHz level), which is highly competitive in spectral beam combining.

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35

Simeonidou, D., S. Hamidi, and A. S. Siddiqui. "Spectral linewidth broadening in erbium-doped and Raman fibre amplifiers." Electronics Letters 28, no. 18 (1992): 1765. http://dx.doi.org/10.1049/el:19921123.

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36

Shi, Jindan, Shaif-ul Alam, and Morten Ibsen. "Sub-watt threshold, kilohertz-linewidth Raman distributed-feedback fiber laser." Optics Letters 37, no. 9 (May 1, 2012): 1544. http://dx.doi.org/10.1364/ol.37.001544.

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37

MAHDI, SHAIMAA, STEFAN MEISTER, AWS AL-SAADI, BÜLENT A. FRANKE, SHA WANG, HANS J. EICHLER, LARS ZIMMERMANN, TIAN HUI, HARALD H. RICHTER, and DAVID STOLAREK. "RAMAN SCATTERING AND GAIN IN SILICON-ON-INSULATOR NANOWIRE WAVEGUIDES." Journal of Nonlinear Optical Physics & Materials 21, no. 02 (June 2012): 1250021. http://dx.doi.org/10.1142/s021886351250021x.

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Raman scattering in air-covered and SiO2 -covered Silicon-on-insulator waveguides of 1.25 cm length, 220 nm height and two widths of 2 μm or 0.45 μm was investigated. A continuous wave (CW) Raman fiber laser at 1454.8 nm with linewidth of <0.1 nm was used as a pump source. The coupling efficiency was estimated to be around 10% for one end facet. Spontaneous Raman shift of 521 cm-1 (1574.2 THz) scattering was observed at 1573.8 nm for SOI waveguides in air and 1574.2 nm for waveguides covered with SiO2 at pump power of <1.5 mW inside both waveguides of 2 and 0.45 μm. Anti-Stokes scattering was observed at 1352.8 nm with pump power of 16 mW. The stimulated Raman gain was calculated from spontaneous Raman efficiency. Total Raman on-off gain was determined to be 0.6 dB for waveguide with width of 2 μm and 1 dB for waveguide with width of 0.45 μm.

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38

Ghamsari, Behnood G., Anthony Olivieri, Fabio Variola, and Pierre Berini. "Enhanced Raman scattering in graphene by plasmonic resonant Stokes emission." Nanophotonics 3, no. 6 (December 1, 2014): 363–71. http://dx.doi.org/10.1515/nanoph-2014-0014.

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AbstractExploiting surface plasmon polaritons to enhance interactions between graphene and light has recently attracted much interest. In particular, nonlinear optical processes in graphene can be dramatically enhanced and controlled by plasmonic nanostructures. This work demonstrates Raman scattering enhancement in graphene based on plasmonic resonant enhancement of the Stokes emission, and compares this mechanism with the conventional Raman enhancement by resonant pump absorption. Arrays of optical nanoantennas with different resonant frequency are utilized to independently identify the effects of each mechanism on Raman scattering in graphene via the measured enhancement factor and its spectral linewidth. We demonstrate that, while both mechanisms offer large enhancement factors (scattering cross-section gains of 160 and 20 for individual nanoantennas, respectively), they affect the graphene Raman spectrum quite differently. Our results provide a benchmark to assess and quantify the role and merit of each mechanism in surface-plasmon-mediated Raman scattering in graphene, and may be employed for design and realization of a variety of graphene optoelectronic devices involving nonlinear optical processes.

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39

Balakrishnan, Gurusamy, Ying Hu, Steen Brøndsted Nielsen, and Thomas G. Spiro. "Tunable kHz Deep Ultraviolet (193–210 nm) Laser for Raman Applications." Applied Spectroscopy 59, no. 6 (June 2005): 776–81. http://dx.doi.org/10.1366/0003702054280702.

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The performance characteristics of a kilohertz solid-state laser source for ultraviolet Raman spectroscopy are described. Deep ultraviolet (UV) excitation in the 193–210 nm region is provided by mixing of the fundamental and third harmonics of a Ti–sapphire laser, which is pumped by the second harmonic of a Q-Switched Nd–YLF laser. The combination of tunability, narrow linewidth, high average power, good stability, and kilohertz repetition rate makes this laser suitable for deep UV resonance Raman applications. The short pulse duration (∼20 ns) permits nanosecond time resolution in pump–probe applications. The low peak power and high data rate provide artifact-free spectra with a high signal-to-noise ratio. UV Raman cross-section and Raman excitation profiles are reported for gaseous O2 (relative to N2), aqueous ClO4−, tyrosine, phenylalanine, tryptophan, histidine, and hemoglobin excited between 193 nm and 210 nm to illustrate laser performance.

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40

Kipkemboi, Pius K., and Allan J. Easteal. "Vibrational spectroscopic studies of aqueous solutions of tert-butyl alcohol and tert-butylamine." Canadian Journal of Chemistry 80, no. 7 (July 1, 2002): 789–95. http://dx.doi.org/10.1139/v02-102.

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Raman and FT-IR absorption spectra of aqueous tert-butyl alcohol (t-BuOH) and tert-butylamine (t-BuNH2) in the region of the OH and NH2 stretching and bending modes have been measured as a function of organic co-solvent concentration in the whole co-solvent mole fraction region. The major observed changes of the aqueous binary solution spectra compared with the solvent spectra are a loss or gain of band intensity. In particular, the observed changes in intensities and linewidths of some bands were significantly more pronounced at low concentrations of organic co-solvents in water, where t-BuOH and t-BuNH2 tend to integrate into the water structure. Clear evidence of structural enhancement of the network is obtained in dilute solutions as well as destruction of the network by hydrophobic interactions as the concentration is increased. Generally, the interpretation of the spectra is in agreement with the capacity of the hydrophobic co-solvent to break the structure of water in the more concentrated aqueous solutions and to enhance the structure in dilute solutions. Vibrational intensities and frequency shifts of some bands show definite trends with varying the concentration of the solutions. In the concentration-dependence study, unusual linewidth changes of certain bands were observed.Key words: infrared, Raman spectra, aqueous, tert-butanol, tert-butylamine.

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41

Towrie, M., G. Gaborel, P. Matousek, A. W. Parker, W. Shaikh, and R. H. Bisby. "Tunable Picosecond Optical Parametric Amplifiers for Time Resolved Resonance Raman Spectroscopy." Laser Chemistry 19, no. 1-4 (January 1, 1999): 153–59. http://dx.doi.org/10.1155/1999/89715.

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A picosecond optical parametric amplifier, OPA, system suitable for pump and probe spectroscopy has been developed. Two OPAs are simultaneously pumped by a titanium sapphire regenerative amplifier to produce several microjoules output over the 470 to 2000 nm wavelength range. One OPA used as the probe operates with c. 25 cm-1 linewidth over this tuning range. The system is optimised for TR3 spectroscopy. Some preliminary experiments on Trolox, a water soluable Vitamin E derivative, are presented.

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42

Chen, Ming, Bin Wang, Jingfan Wang, Hongliang Liu, Zhixiang Chen, Xiaoxuan Xu, and Xing Zhao. "Highly Stable, Graphene-Wrapped, Petal-like, Gap-Enhanced Raman Tags." Nanomaterials 12, no. 10 (May 10, 2022): 1626. http://dx.doi.org/10.3390/nano12101626.

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Gap-enhanced Raman tags (GERTs) were widely used in cell or biological tissue imaging due to their narrow spectral linewidth, weak photobleaching effect, and low biological matrix interference. Here, we reported a new kind of graphene-wrapped, petal-like, gap-enhanced Raman tags (GP-GERTs). The 4-Nitrobenzenethiol (4-NBT) Raman reporters were embedded in the petal-like nanogap, and graphene was wrapped on the surface of the petal-like, gap-enhanced Raman tags. Finite-difference time-domain (FDTD) simulations and Raman experimental studies jointly reveal the Raman enhancement mechanism of graphene. The SERS enhancement of GP-GERTs is jointly determined by the petal-like “interstitial hotspots” and electron transfer between graphene and 4-NBT molecules, and the total Raman enhancement factor (EF) can reach 1010. Mesoporous silica was grown on the surface of GP-GERTs by tetraethyl orthosilicate hydrolysis to obtain Raman tags of MS-GP-GERTs. Raman tag stability experiments showed that: MS-GP-GERTs not only can maintain the signal stability in aqueous solutions of different pH values (from 3 to 12) and simulated the physiological environment (up to 72 h), but it can also stably enhance the signal of different Raman molecules. These highly stable, high-signal-intensity nanotags show great potential for SERS-based bioimaging and multicolor imaging.

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Nordström, Emil, Ali Hosseinnia, Christian Brackmann, Joakim Bood, and Per-Erik Bengtsson. "Raman linewidth measurements using time-resolved hybrid picosecond/nanosecond rotational CARS." Optics Letters 40, no. 24 (December 9, 2015): 5718. http://dx.doi.org/10.1364/ol.40.005718.

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Liu, Wei, Yu Miao, Pengfei Ma, Pu Zhou, and Zongfu Jiang. "Theoretical study of narrow-linewidth hybrid rare-earth-Raman fiber amplifiers." Optics Express 27, no. 10 (May 6, 2019): 14523. http://dx.doi.org/10.1364/oe.27.014523.

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Li, Zhixian, Wei Huang, Yulong Cui, and Zefeng Wang. "Efficient high power, narrow linewidth 19 μm fiber hydrogen Raman amplifier." Applied Optics 57, no. 14 (May 9, 2018): 3902. http://dx.doi.org/10.1364/ao.57.003902.

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Echarri, Daniel T., Katerina Chrysalidis, Valentin N. Fedosseev, Bruce A. Marsh, Richard P. Mildren, Santiago M. Olaizola, David J. Spence, Shane G. Wilkins, and Eduardo Granados. "Broadly tunable linewidth-invariant Raman Stokes comb for selective resonance photoionization." Optics Express 28, no. 6 (March 10, 2020): 8589. http://dx.doi.org/10.1364/oe.384630.

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Gupta, R., G. Venketeswara Pai, A. K. Sood, T. V. Ramakrishnan, and C. N. R. Rao. "Raman scattering in charge-ordered Pr0.63Ca0.37MnO3: Anomalous temperature dependence of linewidth." Europhysics Letters (EPL) 58, no. 5 (June 2002): 778–84. http://dx.doi.org/10.1209/epl/i2002-00417-3.

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Shields, A. J., G. O. Smith, E. J. Mayer, R. Eccleston, J. Kuhl, M. Cardona, and K. Ploog. "Homogeneous-linewidth dependence of resonant Raman scattering in GaAs quantum wells." Physical Review B 48, no. 23 (December 15, 1993): 17338–42. http://dx.doi.org/10.1103/physrevb.48.17338.

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Singh, Ranjan K., S. N. Singh, B. P. Asthana, and C. M. Pathak. "Deconvolution of lorentzian Raman Linewidth: Techniques of polynomial fitting and extrapolation." Journal of Raman Spectroscopy 25, no. 6 (June 1994): 423–28. http://dx.doi.org/10.1002/jrs.1250250608.

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Tanabe, Kazutoshi, and Seiji Tsuzuki. "Raman linewidth study of intermolecular interactions of methanol in aqueous solution." Spectrochimica Acta Part A: Molecular Spectroscopy 42, no. 5 (January 1986): 611–14. http://dx.doi.org/10.1016/0584-8539(86)80143-x.

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