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Journal articles on the topic 'Stimulated Raman transition'

Author: Grafiati

Published: 4 June 2021

Last updated: 6 July 2024

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1

Fainberg, B. D., and B. Levinsky. "Stimulated Raman Adiabatic Passage in a Dense Medium." Advances in Physical Chemistry 2010 (December 22, 2010): 1–8. http://dx.doi.org/10.1155/2010/798419.

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We have considered a coherent population transfer to a higher excited singlet state (S2) of molecules with anomalous fluorescence in molecular assemblies (e.g., a dense medium). A direct excitation to S2 requires light in the UV region. Because of this, the transition is conveniently realized by a two-step (two-photon) process: S0→S1→S2, where transitions S0→S1 and S1→S2 correspond to the optical region. We have shown that efficient stimulated Raman adiabatic passage (STIRAP) in the ladder configuration can be realized in this case, using suitably chirped pulses, to compensate a change of the two-photon transition frequency in time, induced by the pulses themselves, due to near dipole-dipole interactions. We have provided a reduced state formulation of the optical control process. Chirping the “pump” pulse that excites transition S0→S1 is nonequivalent to chirping the “Stokes” pulse that excites transition S1→S2, with respect to the population of the intermediate state (S1) in the pulse nonadiabatic regime. We have also shown that with suitably chirped pulses, efficient STIRAP still persists even for a rather large decay of the intermediate state.

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2

He Huiyong, 贺慧勇, and 黄春佳 Huang Chunjia. "Squeezed Atom Laser Oringinating From Stimulated Raman Transition." Acta Optica Sinica 29, no. 12 (2009): 3531–35. http://dx.doi.org/10.3788/aos20092912.3531.

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3

Henkel, Carsten, Klaus Mølmer, Robin Kaiser, and Christoph I. Westbrook. "Atomic diffraction assisted by a stimulated Raman transition." Physical Review A 56, no. 1 (July 1, 1997): R9—R12. http://dx.doi.org/10.1103/physreva.56.r9.

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4

Karpf, Sebastian, Matthias Eibl, Wolfgang Wieser, Thomas Klein, and Robert Huber. "Shot-Noise Limited Time-Encoded Raman Spectroscopy." Journal of Spectroscopy 2017 (2017): 1–6. http://dx.doi.org/10.1155/2017/9253475.

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Raman scattering, an inelastic scattering mechanism, provides information about molecular excitation energies and can be used to identify chemical compounds. Albeit being a powerful analysis tool, especially for label-free biomedical imaging with molecular contrast, it suffers from inherently low signal levels. This practical limitation can be overcome by nonlinear enhancement techniques like stimulated Raman scattering (SRS). In SRS, an additional light source stimulates the Raman scattering process. This can lead to orders of magnitude increase in signal levels and hence faster acquisition in biomedical imaging. However, achieving a broad spectral coverage in SRS is technically challenging and the signal is no longer background-free, as either stimulated Raman gain (SRG) or loss (SRL) is measured, turning a sensitivity limit into a dynamic range limit. Thus, the signal has to be isolated from the laser background light, requiring elaborate methods for minimizing detection noise. Here, we analyze the detection sensitivity of a shot-noise limited broadband stimulated time-encoded Raman (TICO-Raman) system in detail. In time-encoded Raman, a wavelength-swept Fourier domain mode locking (FDML) laser covers a broad range of Raman transition energies while allowing a dual-balanced detection for lowering the detection noise to the fundamental shot-noise limit.

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5

Kien, Fam Le, and K. Hakuta. "Stimulated Raman scattering with slow light." Canadian Journal of Physics 78, no. 5-6 (April 5, 2000): 543–59. http://dx.doi.org/10.1139/p00-014.

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We study the propagation dynamics of weak Raman sideband fields in a far-off-resonance Raman medium driven by a strong coupling field. We show that the interaction of the system with the strong field, under the conditions of high density, narrow Raman-transition width, and small two-photon detuning, results ina slow group velocity and a substantial enhancement of the injected anti-Stokes sideband field as well as an efficient generation of a Stokes sideband field. We find that the effective group velocity is the same for the two weak fields and is proportional to the field frequency difference instead of the frequency of the corresponding field. We also discuss the condition for exponential growth of the two sideband fields in the medium. We perform numerical calculations for solid hydrogen, a realistic system where the requirements for high density and small Raman width can be met. We demonstrate that the group velocity can be slowed down by several orders, and that the slow light plays a key role for the stimulated Raman scattering process in solid hydrogen.PACS Nos.: 42.50Gy, 42.50Hz, 42.65Ky, 42.79Nv

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6

Shen, Chencheng, Xianglong Cai, Tiancheng Zheng, Yuxi Jia, Dong Liu, Jinbo Liu, and Jingwei Guo. "Mid-Infrared Multispectral Gaseous Stimulated Raman Scattering Laser." Applied Sciences 11, no. 24 (December 14, 2021): 11875. http://dx.doi.org/10.3390/app112411875.

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We demonstrated mid-infrared gaseous stimulated Raman scattering lasers in free space. Mixed gases of hydrogen and deuterium were used as Raman gain media in one Raman cell. Pumped by laser pulses at 1064 nm, the first Stokes Raman components at 1560 nm and 1907 nm were generated. A four-wave mixing process with the pump laser at 1064 nm and Raman lasers at 1560 nm and 1907 nm contributed to dramatically reducing the threshold of mid-IR laser generation at 4432 nm. The maximum output peak power of a mid-IR laser at 4432 nm reached 121 kW. Furthermore, by scattering on the rotational transition of deuterium, multispectral mid-IR Raman lasers at wavelengths of 2071 nm, 2266 nm, 2604 nm, 2920 nm, 3322 nm, 3743 nm, 4432 nm, and 5431 nm were also generated. Our results show that this is a convenient method to reduce the threshold and achieve a high power output with mid-IR Raman lasers.

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7

Huang, Chunjia, Huiyong He, and Lijun Tang. "Generating of squeezed atom laser via stimulated Raman transition." Optics Communications 282, no. 15 (August 2009): 3177–80. http://dx.doi.org/10.1016/j.optcom.2009.04.042.

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8

Katsuragawa, M., M. Suzuki, R. S. D. Sihombing, J. Z. Li, and K. Hakuta. "Nonlinear optics in solid hydrogen." Laser and Particle Beams 16, no. 4 (December 1998): 641–48. http://dx.doi.org/10.1017/s0263034600011459.

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We show through experiments of stimulated Raman scattering how solid hydrogen (parahydrogen) can open new perspectives on nonlinear optics. Two phenomena are described: One is the self-induced phase matching in parametric anti-Stokes stimulated Raman scattering (SRS) in which the phase matching is self-organized automatically without the stringent restriction of refractive-index dispersion of the medium, and the other is the extremely slow coherence decay behavior for the Raman transition that may result in the Raman width of 80 kHz full width at half maximum (FWHM).

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9

Baklanov, E. V., S. M. Kobtsev, and A. V. Taichenachev. "Precision Measurements of Forbidden Transition Frequencies Using Stimulated Raman Scattering." Optics and Spectroscopy 125, no. 5 (November 2018): 679–83. http://dx.doi.org/10.1134/s0030400x18110061.

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10

Sanborn, F., and C. R. Menyuk. "Transition from transient to stationary behavior in stimulated Raman scattering." Journal of the Optical Society of America B 13, no. 9 (September 1, 1996): 1921. http://dx.doi.org/10.1364/josab.13.001921.

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11

Kim, Ji Yeon, and D. Cho. "Stimulated Raman Clock Transition Without a Differential ac Stark Shift." Journal of the Korean Physical Society 37, no. 5 (November 1, 2000): 744–50. http://dx.doi.org/10.3938/jkps.37.744.

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12

Škorić, M. M., M. S. Jovanović, and M. R. Rajković. "Transition to turbulence via spatiotemporal intermittency in stimulated Raman backscattering." Physical Review E 53, no. 4 (April 1, 1996): 4056–66. http://dx.doi.org/10.1103/physreve.53.4056.

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13

Zhou, Zi-Chao, Rong Wei, Chun-Yan Shi, Tang Li, and Yu-Zhu Wang. "Magnetic field measurement based on a stimulated two-photon Raman transition." Chinese Physics B 20, no. 3 (March 2011): 034206. http://dx.doi.org/10.1088/1674-1056/20/3/034206.

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14

Rose, Harvey A. "Langmuir wave turbulence transition in a model of stimulated Raman scatter." Physics of Plasmas 7, no. 6 (June 2000): 2571–77. http://dx.doi.org/10.1063/1.874098.

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15

Yi, Hong-Gang, and Rong-Hua Chen. "Generating Spin Squeezed State of Atom-Photon with Stimulated Raman Transition." International Journal of Theoretical Physics 52, no. 10 (June 6, 2013): 3608–14. http://dx.doi.org/10.1007/s10773-013-1665-5.

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16

Yi, Xiao-Jie, Guo-Qiang Huang, and Jian-Min Wang. "Controlling Single-Particle Coherence and Spin Squeezing with Stimulated Raman Transition." International Journal of Theoretical Physics 53, no. 3 (October 31, 2013): 893–98. http://dx.doi.org/10.1007/s10773-013-1878-7.

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17

Ivanisik, A. I. "Scattering of Ginzburg–Frank and Cherenkov Types Under Self-Focusing of Nanosecond Laser Pulses in Liquids." Ukrainian Journal of Physics 63, no. 4 (June 18, 2018): 285. http://dx.doi.org/10.15407/ujpe63.4.285.

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We study the dynamics of nonlinear optical processes such as self-focusing, self-phase modulation, and stimulated Raman scattering in Kerr-liquids under the nanosecond laser pulse excitation. The results prove the existence of the transition Ginzburg–Frank-type effect, which promotes the appearance of new spectral components of the laser radiation at the medium boundary. The generation of extended anti-Stokes frequency-angular bands of stimulated Raman scattering is explained. When the velocity of a self-focusing focal spot matches the phase velocity of the non-linear polarization at the anti-Stokes Raman frequency and the phase velocity of the scattered axial radiation, the most intense frequency-angular bands appear. They are described by the equations typical of the Cherenkov radiation.

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18

Kochanov, V. P., and Yu V. Bogdanova. "Two-wave stimulated Raman scattering in the field of intense radiation resonant to the Raman transition." Journal of Experimental and Theoretical Physics 96, no. 2 (February 2003): 202–21. http://dx.doi.org/10.1134/1.1560394.

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19

Rohringer, Nina. "X-ray Raman scattering: a building block for nonlinear spectroscopy." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 377, no. 2145 (April 2019): 20170471. http://dx.doi.org/10.1098/rsta.2017.0471.

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Ultraintense X-ray free-electron laser pulses of attosecond duration can enable new nonlinear X-ray spectroscopic techniques to observe coherent electronic motion. The simplest nonlinear X-ray spectroscopic concept is based on stimulated electronic X-ray Raman scattering. We present a snapshot of recent experimental achievements, paving the way towards the goal of realizing nonlinear X-ray spectroscopy. In particular, we review the first proof-of-principle experiments, demonstrating stimulated X-ray emission and scattering in atomic gases in the soft X-ray regime and first results of stimulated hard X-ray emission spectroscopy on transition metal complexes. We critically asses the challenges that have to be overcome for future successful implementation of nonlinear coherent X-ray Raman spectroscopy. This article is part of the theme issue ‘Measurement of ultrafast electronic and structural dynamics with X-rays’.

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20

Zhao, Xiuchao, Xianping Sun, Maohua Zhu, Xiaofei Wang, Chaohui Ye, and Xin Zhou. "Atomic filter based on stimulated Raman transition at the rubidium D1 line." Optics Express 23, no. 14 (July 1, 2015): 17988. http://dx.doi.org/10.1364/oe.23.017988.

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21

Xiao, C. Z., H. B. Zhuo, Y. Yin, Z. J. Liu, C. Y. Zheng, and X. T. He. "Transition from two-plasmon decay to stimulated Raman scattering under ignition conditions." Nuclear Fusion 60, no. 1 (November 14, 2019): 016022. http://dx.doi.org/10.1088/1741-4326/ab4e79.

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22

Grenier, P., D. Houde, S. Jandl, and L. A. Boatner. "Determination of the A1(TO) soft-mode damping rate in KTa0.93Nb0.07O3." Canadian Journal of Physics 72, no. 1-2 (January 1, 1994): 40–43. http://dx.doi.org/10.1139/p94-007.

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Raman-scattering and infrared reflectivity experiments were conducted using a KTa0.93Nb0.07O3 single crystal with a ferroelectric phase transition temperature of Tc ≈ 68 K. The values obtained for the damping rate of the A1(TO(transverse optical)) soft-mode appear to be half of those determined by impulsive stimulated Raman scattering. Since the latter experiment probes the soft-mode in the polariton regime, while the former probes outside of this region, the observed discrepancy points towards some additional interaction for the polariton soft-mode.

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23

Ranjan, Rajeev, Giovanni Costa, Maria Antonietta Ferrara, Mario Sansone, and Luigi Sirleto. "Noise Measurements and Noise Statistical Properties Investigations in a Stimulated Raman Scattering Microscope Based on Three Femtoseconds Laser Sources." Photonics 9, no. 12 (November 28, 2022): 910. http://dx.doi.org/10.3390/photonics9120910.

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To induce a Raman-active transition in a material, stimulated Raman scattering (SRS) spectroscopy/microscopy implementations typically rely on two pulsed laser sources. One of their limitations is that not all of the regions of Raman spectra can be investigated, so only some applications can be exploited. In this paper, the noise characterizations of a stimulated Raman scattering spectroscopy/microscopy implementation, based on the insertion of a third pulsed laser source, are provided. The merit of this system is that it is able to explore the large variety of SRS applications. In order to characterize our system, an investigation of different kinds of noises due to the laser sources and electronics sources was carried out. Firstly, the relative intensity noises of three femtosecond laser sources were measured. Secondly, noise characterizations of the detection system were carried out and our findings prove that our SRS microscope is shot noise-limited, demonstrating that the third laser source introduction is well suited and satisfies our purpose. Finally, the statistical properties of the overall image noises are analyzed and discussed.

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24

Zinovieva, Aigul F., Vladimir A. Zinovyev, Natalia P. Stepina, Vladimir A. Volodin, Aleksey Y. Krupin, Aleksey V. Kacyuba, and Anatoly V. Dvurechenskii. "Radiation-Stimulated Formation of Two-Dimensional Structures Based on Calcium Silicide." Nanomaterials 12, no. 20 (October 16, 2022): 3623. http://dx.doi.org/10.3390/nano12203623.

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The formation of CaSi2 polycrystalline structures under the postgrowth electron irradiation of epitaxial CaF2/Si(111) films with embedded thin Si layers was studied. The dependence on the electron exposure time was investigated for two types of structures with different film thicknesses. The optimal conditions for the formation of two-dimensional CaSi2 structures were found. Raman spectra of the structures after a 1 min electron irradiation demonstrated only one pronounced peak corresponding to the vibrations of Si atoms in the plane of the calcium-intercalated two-dimensional Si layer. An increase in the exposure time resulted in the transition from two- to three-dimensional CaSi2 structures having more complex Raman spectra with additional peaks typical of bulk CaSi2 crystals. Based on the results of microscopic studies and transport measurements, a model explaining the observed effects was proposed.

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25

Mikheev, Gen M. "Backward stimulated Raman scattering on theQ12(1) transition in vibrationally excited hydrogen molecules." Quantum Electronics 29, no. 4 (April 30, 1999): 341–46. http://dx.doi.org/10.1070/qe1999v029n04abeh001484.

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26

Shirmohammad, Maryam, Michael A. Short, and Haishan Zeng. "A New Gas Analysis Method Based on Single-Beam Excitation Stimulated Raman Scattering in Hollow Core Photonic Crystal Fiber Enhanced Raman Spectroscopy." Bioengineering 10, no. 10 (October 3, 2023): 1161. http://dx.doi.org/10.3390/bioengineering10101161.

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We previously developed a hollow-core photonic crystal fiber (HCPCF) based Raman scattering enhancement technique for gas/human breath analysis. It enhances photon–gas molecule interactions significantly but is still based on CW laser excitation spontaneous Raman scattering, which is a low-probability phenomenon. In this work, we explored nanosecond/sub-nanosecond pulsed laser excitation in HCPCF based fiber enhanced Raman spectroscopy (FERS) and successfully induced stimulated Raman scattering (SRS) enhancement. Raman measurements of simple and complex gases were performed using the new system to assess its feasibility for gas analysis. We studied the gas Raman scattering characteristics, the relationship between Raman intensities and pump energies, and the energy threshold for the transition from spontaneous Raman scattering to SRS. H2, CO2, and propene (C3H6) were used as test gases. Our results demonstrated that a single-beam pulsed pump combined with FERS provides an effective Raman enhancement technique for gas analysis. Furthermore, an energy threshold for SRS initiation was experimentally observed. The SRS-capable FERS system, utilizing a single-beam pulsed pump, shows great potential for analyzing complex gases such as propene, which is a volatile organic compound (VOC) gas, serving as a biomarker in human breath for lung cancer and other human diseases. This work contributes to the advancement of gas analysis and opens alternative avenues for exploring novel Raman enhancement techniques.

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27

Baklanov, E. V., P. V. Pokasov, and A. V. Taichenachev. "Resonant Stimulated Raman Scattering from the 23S–11S Forbidden Transition in a Helium Atom." Optics and Spectroscopy 129, no. 10 (October 2021): 1063–67. http://dx.doi.org/10.1134/s0030400x21080038.

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28

Wang, Y. X., Q. S. Feng, H. C. Zhang, Q. Wang, C. Y. Zheng, Z. J. Liu, and X. T. He. "Transition of backward stimulated Raman scattering from absolute to convective instability via density modulation." Physics of Plasmas 24, no. 10 (October 2017): 103122. http://dx.doi.org/10.1063/1.4993304.

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29

Momose, Takamasa, David P. Weliky, and Takeshi Oka. "The stimulated Raman gain spectrum of the Q1←0(0) transition of solid parahydrogen." Journal of Molecular Spectroscopy 153, no. 1-2 (May 1992): 760–61. http://dx.doi.org/10.1016/0022-2852(92)90511-l.

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30

Kajewski, Dariusz, Irena Jankowska-Sumara, Jae-Hyeon Ko, Jeong Woo Lee, Syed Furqan Ul Hassan Naqvi, Rafał Sitko, Andrzej Majchrowski, and Krystian Roleder. "Long-Term Isothermal Phase Transformation in Lead Zirconate." Materials 15, no. 12 (June 8, 2022): 4077. http://dx.doi.org/10.3390/ma15124077.

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Lead zirconate PbZrO3 has been the subject of research interest for several dozen years. Recently, even its antiferroelectric properties have started to be questioned, and many researchers still deal with the so-called intermediate phase below Curie temperature (TC), whose existence is not fully understood. It turns out that PbZrO3 doped with Nb exhibits below TC phases with complex domain structures. One of them undergoes self-organization taking place at a constant temperature, and transforms, after several minutes, into a lower phase. This isothermal transition was investigated through dielectric, pyroelectric current and Raman scattering measurements. Discontinuities accompanied it in the permittivity and pyroelectric current. The obtained Raman spectra proved that those discontinuities are strictly linked with the isothermal transition between two intermediate phases. The ordering process in lead sublattice stimulated by thermal fluctuations is discussed as a driving force for this peculiar phenomenon.

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31

Бакланов, Е. В., and А. В. Тайченачев. "Возможность создания стандарта частоты 62.6 nm в гелии с использованием вынужденного комбинационного рассеяния." Журнал технической физики 128, no. 11 (2020): 1592. http://dx.doi.org/10.21883/os.2020.11.50160.162-20.

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The possibility of creating a frequency standard based on the 23S-11S (62.6 nm) forbidden transition of a helium atom using stimulated Raman scattering is shown. The 11S singlet state is the ground state, while the 23S metastable state (He *) has the lowest energy in the triplet part of the spectrum. The standard can be used to measure frequencies in the region of extreme ultraviolet and possibly X-ray radiation.

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32

GUERRA, R., J. T. MENDONÇA, and P. K. SHUKLA. "Stimulated Raman, Brillouin and dust–Brillouin scattering in dusty plasmas." Journal of Plasma Physics 59, no. 2 (February 1998): 343–65. http://dx.doi.org/10.1017/s002237789700620x.

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Stimulated scatterings of large-amplitude electromagnetic waves by Langmuir, dust–ion-acoustic and dust-acoustic waves in unmagnetized dusty plasmas are investigated by employing the standard methods of nonlinear three-wave interactions and by incorporating the effects of grain-charge fluctuations, collisions of electrons and ions with dust grains, the plasma drag on a dust grain (for the case of the dust-acoustic wave) and the dependence of the average dust charge on the dusty plasma parameters. Distinction is made between the charging collisions, when electrons and ions are accumulated onto the grain surface; and Coulomb collisions, when electrons and ions are simply deflected from the grain surface. We investigate the regimes for which Coulomb collisions can be treated under the small-angle-deflection approximation. If the intergrain average spacing is equal to or smaller than the Debye length, the collision frequencies of plasma species with dust grains can be much larger than any collision frequency of the plasma species amongst themselves. In the case of Brillouin stimulated scattering, other important contributions to damping come from Landau and dust-charge fluctuation damping. In the case of dust–Brillouin stimulated scattering, the most important contribution to damping comes from dust-charge fluctuation (if the intergrain average spacing is equal to or smaller than the Debye length) and plasma drag on the dust particles (if the intergrain average spacing is larger than the Debye length). We derive the instability thresholds as a function of the density of the dust grains. Because of the inclusion of the new effects, in both Raman and Brillouin scatterings it is found that the instability threshold powers are drastically increased relative to the dust-free case. In the case of dust–Brillouin scattering, a minimum for the threshold power is found in the transition region between ‘dusty’ and ‘dust-in’ plasma. Growth rates near thresholds are also discussed.

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33

Chimczak, Grzegorz. "High fidelity state mapping performed in a V-type level structure via stimulated Raman transition." Journal of Physics B: Atomic, Molecular and Optical Physics 48, no. 5 (February 4, 2015): 055502. http://dx.doi.org/10.1088/0953-4075/48/5/055502.

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34

Ghosh, Swaralipi, Sanjay Sen, S. S. Bhattacharyya, and Samir Saha. "Nonadiabatic interaction effects on population transfer inH2by stimulated Raman transition with partially overlapping laser pulses." Physical Review A 59, no. 6 (June 1, 1999): 4475–84. http://dx.doi.org/10.1103/physreva.59.4475.

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35

Fujii, Shun, Takumi Kato, Ryo Suzuki, Atsuhiro Hori, and Takasumi Tanabe. "Transition between Kerr comb and stimulated Raman comb in a silica whispering gallery mode microcavity." Journal of the Optical Society of America B 35, no. 1 (December 12, 2017): 100. http://dx.doi.org/10.1364/josab.35.000100.

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36

Бакланов, Е. В., П. В. Покасов, and А. В. Тайченачев. "Резонансное вынужденное комбинационное рассеяние на запрещенном переходе 2-=SUP=-3-=/SUP=-S-1-=SUP=-1-=/SUP=-S атома гелия." Оптика и спектроскопия 129, no. 8 (2021): 975. http://dx.doi.org/10.21883/os.2021.08.51190.1802-21.

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Resonant stimulated Raman scattering (SRS) on the 23S-11S forbidden transition of the helium atom (62.6 nm) through the intermediate 23P1 level is considered. The 23S metastable state has the lowest energy in the triplet part of the spectrum (He *), and the 11S state is the ground state. For the density matrix, shortened kinetic equations are derived, which are used to analyze the SRS resonance. Expressions for field broadening and resonance shift are obtained, Doppler broadening is taken into account, and numerical estimates are made.

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37

Venkin, G. V., D. A. Esikov, D. I. Maleev, and G. M. Mikheev. "Energy characteristics of stimulated Raman scattering due to theQ12(1) transition in vibrationally excited hydrogen molecules." Soviet Journal of Quantum Electronics 16, no. 2 (February 28, 1986): 247–52. http://dx.doi.org/10.1070/qe1986v016n02abeh005756.

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38

Sheka, Elena F., Yevgeny A. Golubev, and Nadezhda A. Popova. "Graphene Domain Signature of Raman Spectra of sp2 Amorphous Carbons." Nanomaterials 10, no. 10 (October 14, 2020): 2021. http://dx.doi.org/10.3390/nano10102021.

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The standard D-G-2D pattern of Raman spectra of sp2 amorphous carbons is considered from the viewpoint of graphene domains presenting their basic structure units (BSUs) in terms of molecular spectroscopy. The molecular approximation allows connecting the characteristic D-G doublet spectra image of one-phonon spectra with a considerable dispersion of the C=C bond lengths within graphene domains, governed by size, heteroatom necklace of BSUs as well as BSUs packing. The interpretation of 2D two-phonon spectra reveals a particular role of electrical anharmonicity in the spectra formation and attributes this effect to a high degree of the electron density delocalization in graphene domains. A size-stimulated transition from molecular to quasi-particle phonon consideration of Raman spectra was experimentally traced, which allowed evaluation of a free path of optical phonons in graphene crystal.

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39

Ghosh, Swaralipi, Sanjay Sen, SS Bhattacharyya, and Samir Saha. "Effect of polarization on population transfer in H2 by stimulated Raman transition with partially overlapping laser pulses." Pramana 54, no. 6 (June 2000): 827–44. http://dx.doi.org/10.1007/s12043-000-0178-y.

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40

Feshchenko, Galyna, and Vladimir Feshchenko. "Computer Simulation of Transition Regimes of Solitons in Stimulated Raman Scattering with Excitation of Polar Optical Phonons." American Journal of Computational Mathematics 05, no. 03 (2015): 336–44. http://dx.doi.org/10.4236/ajcm.2015.53031.

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41

Saadati-Niari, M., and N. Shirkhanghah. "Population transfer in a nonlinear three-level Λ-system by Stark - chirped rapid adiabatic passage." Canadian Journal of Physics 99, no. 9 (September 2021): 799–805. http://dx.doi.org/10.1139/cjp-2020-0563.

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We propose the use of the Stark-chirped rapid adiabatic passage (SCRAP) method to induce a complete population transfer in a nonlinear three-level Λ-type system (nl-SCRAP). We also use the nl-SCRAP method for creating stable diatomic ground molecular Bose–Einstein condensates (BECs) from atomic BECs. In this three-laser technique the pump and Stokes pulses are slightly detuned from transition frequencies, and a third strong hyperbolic-tangent laser pulse induces dynamic Stark shifts of the relevant transitions and compensates for third-order nonlinearities. If the timing of the three pulses is appropriately chosen, the nonlinear quantum system is prepared to almost complete population inversion between the two lower states in the Λ-like scheme. The paper shows that the efficiency of the nl-SCRAP is higher than the nonlinear stimulated Raman adiabatic passage (nl-STIRAP) technique, and this method can be used in one-photon as well as multi-photon transitions. The transfer process is robust concerning fluctuations of experimental parameters, such as peak Rabi frequencies, the time delay between pulses, and static detunings.

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Zhang, Luyuan, and Wei Min. "Bioorthogonal chemical imaging of metabolic changes during epithelial–mesenchymal transition of cancer cells by stimulated Raman scattering microscopy." Journal of Biomedical Optics 22, no. 10 (October 17, 2017): 1. http://dx.doi.org/10.1117/1.jbo.22.10.106010.

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Pezzotti, Giuseppe. "Quantitative Assessment of Crack-Tip Stress Field in Semiconductor GaN Using Electrostimulated Piezo-Spectroscopy." Key Engineering Materials 333 (March 2007): 127–36. http://dx.doi.org/10.4028/www.scientific.net/kem.333.127.

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The piezo-spectroscopic (PS) effect, which may be defined as the shift in wavelength of a spectroscopic transition in a solid in response to an applied strain or stress, may occur both in crystalline and in amorphous structures, regardless of the particular spectroscopic transition involved (e.g., luminescence or Raman spectrum), and independent of the specific mechanism of luminescence emission (i.e., including spectra generated from substitutional impurities, optically active point defects, etc.). The PS effect can be monitored on electro-stimulated spectra when the scale on which the needed characterization lie is of a nanometer length. This effect, being a physical property of the studied material, should be calibrated case by case. The high scanning speed (and computer control) of the electron beam, which can be easily obtained with scan coils, is unsurpassed. Since the most recently developed optoelectronic devices have active areas of submicron dimensions and many of them less than 100 nm, no obvious choice is left but urgently developing an electro-stimulated probe for nano-scale residual stress assessments. In this paper, we show the feasibility of nano-scale stress assessments in the neighborhood of the tip of a crack propagating in GaN, selected as a paradigm semiconductor material.

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Kaneva, Ekaterina, Roman Shendrik, Elizaveta Pankrushina, Emilia Dokuchits, Tatiana Radomskaya, Mikhail Pechurin, and Aleksey Ushakov. "Frankamenite: Relationship between the Crystal–Chemical and Vibrational Properties." Minerals 13, no. 8 (July 29, 2023): 1017. http://dx.doi.org/10.3390/min13081017.

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The study provides novel insights into the crystal–chemical and optical characteristics of frankamenite. Frankamenite belongs to a special group (canasite group) of the complex alkaline Ca-(K)-(Na) silicates, and it was found in charoitites from the only known location, Murun Massif, Eastern Siberia, Russia. The crystal–chemical, vibrational, and optical properties of frankamenite were investigated by combining electron probe microanalysis (EPMA), single-crystal X-ray diffraction (SCXRD), infrared (IR) absorption, Raman, UV-Visible absorption, and electron spin resonance (ESR) spectroscopy. The behavior of the peaks in the IR spectra was also studied using ab initio calculations. Detailed characteristics of the internal composition and structure of the mineral species were described, and vibrational and optical properties based on these peculiarities were interpreted. The thermally stimulated reorientation of the H2O molecules and OH− groups was studied by thermo-Raman spectroscopy. Octahedral cationic positions can be readily doped with transition metal and lanthanide ions that provide a promising opportunity to adjust the Ce3+ luminescence. Hence, frankamenite is a potential material for ion exchange, novel phosphors, and luminophores.

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Wang, Cui-Xia. "Entanglement Property of Bose-Einstein Condensate Atoms and the Photons of the Probe Light Field Via Stimulated Raman Transition." International Journal of Theoretical Physics 56, no. 11 (August 18, 2017): 3455–59. http://dx.doi.org/10.1007/s10773-017-3511-7.

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Otsuka, Hiroyuki, and Totaro Imasaka. "Efficient generation of rotational stimulated Raman emission arising from the S0(0) transition of cooled deuterium in the visible region." Optics Communications 237, no. 4-6 (July 2004): 417–22. http://dx.doi.org/10.1016/j.optcom.2004.03.083.

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Matsuda, Akitaka, Ken-ichi Kondo, and Kazutaka G. Nakamura. "Nanosecond Time-Resolved Stimulated Raman Spectra of Benzene under Shock Compression up to 4.2 GPa: Observation of Liquid-Solid Phase Transition." Japanese Journal of Applied Physics 43, No. 12B (November 26, 2004): L1614—L1616. http://dx.doi.org/10.1143/jjap.43.l1614.

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Havryliuk, Yevhenii, Volodymyr Dzhagan, Anatolii Karnaukhov, Oleksandr Selyshchev, Julia Hann, and Dietrich R. T. Zahn. "Influence of Thermal and Flash-Lamp Annealing on the Thermoelectrical Properties of Cu2ZnSnS4 Nanocrystals Obtained by “Green” Colloidal Synthesis." Nanomaterials 13, no. 11 (May 31, 2023): 1775. http://dx.doi.org/10.3390/nano13111775.

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The problem with waste heat in solar panels has stimulated research on materials suitable for hybrid solar cells, which combine photovoltaic and thermoelectric properties. One such potential material is Cu2ZnSnS4 (CZTS). Here, we investigated thin films formed from CZTS nanocrystals obtained by “green” colloidal synthesis. The films were subjected to thermal annealing at temperatures up to 350 °C or flash-lamp annealing (FLA) at light-pulse power densities up to 12 J/cm2. The range of 250–300 °C was found to be optimal for obtaining conductive nanocrystalline films, for which the thermoelectric parameters could also be determined reliably. From phonon Raman spectra, we conclude that in this temperature range, a structural transition occurs in CZTS, accompanied by the formation of the minor CuxS phase. The latter is assumed to be a determinant for both the electrical and thermoelectrical properties of CZTS films obtained in this way. For the FLA-treated samples, the film conductivity achieved was too low to measure the thermoelectric parameters reliably, although the partial improvement of the CZTS crystallinity is observed in the Raman spectra. However, the absence of the CuxS phase supports the assumption of its importance with respect to the thermoelectric properties of such CZTS thin films.

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Solaris, Janak, Taylor D. Krueger, Cheng Chen, and Chong Fang. "Photogrammetry of Ultrafast Excited-State Intramolecular Proton Transfer Pathways in the Fungal Pigment Draconin Red." Molecules 28, no. 8 (April 16, 2023): 3506. http://dx.doi.org/10.3390/molecules28083506.

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Proton transfer processes of organic molecules are key to charge transport and photoprotection in biological systems. Among them, excited-state intramolecular proton transfer (ESIPT) reactions are characterized by quick and efficient charge transfer within a molecule, resulting in ultrafast proton motions. The ESIPT-facilitated interconversion between two tautomers (PS and PA) comprising the tree fungal pigment Draconin Red in solution was investigated using a combination of targeted femtosecond transient absorption (fs-TA) and excited-state femtosecond stimulated Raman spectroscopy (ES-FSRS) measurements. Transient intensity (population and polarizability) and frequency (structural and cooling) dynamics of –COH rocking and –C=C, –C=O stretching modes following directed stimulation of each tautomer elucidate the excitation-dependent relaxation pathways, particularly the bidirectional ESIPT progression out of the Franck–Condon region to the lower-lying excited state, of the intrinsically heterogeneous chromophore in dichloromethane solvent. A characteristic overall excited-state PS-to-PA transition on the picosecond timescale leads to a unique “W”-shaped excited-state Raman intensity pattern due to dynamic resonance enhancement with the Raman pump–probe pulse pair. The ability to utilize quantum mechanics calculations in conjunction with steady-state electronic absorption and emission spectra to induce disparate excited-state populations in an inhomogeneous mixture of similar tautomers has broad implications for the modeling of potential energy surfaces and delineation of reaction mechanisms in naturally occurring chromophores. Such fundamental insights afforded by in-depth analysis of ultrafast spectroscopic datasets are also beneficial for future development of sustainable materials and optoelectronics.

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Shen, Yihui, Zhilun Zhao, Luyuan Zhang, Lingyan Shi, Sanjid Shahriar, Robin B. Chan, Gilbert Di Paolo, and Wei Min. "Metabolic activity induces membrane phase separation in endoplasmic reticulum." Proceedings of the National Academy of Sciences 114, no. 51 (December 1, 2017): 13394–99. http://dx.doi.org/10.1073/pnas.1712555114.

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Membrane phase behavior has been well characterized in model membranes in vitro under thermodynamic equilibrium state. However, the widely observed differences between biological membranes and their in vitro counterparts are placing more emphasis on nonequilibrium factors, including influx and efflux of lipid molecules. The endoplasmic reticulum (ER) is the largest cellular membrane system and also the most metabolically active organelle responsible for lipid synthesis. However, how the nonequilibrium metabolic activity modulates ER membrane phase has not been investigated. Here, we studied the phase behavior of functional ER in the context of lipid metabolism. Utilizing advanced vibrational imaging technique, that is, stimulated Raman scattering microscopy, we discovered that metabolism of palmitate, a prevalent saturated fatty acid (SFA), could drive solid-like domain separation from the presumably uniformly fluidic ER membrane, a previously unknown phenomenon. The potential of various fatty acids to induce solid phase can be predicted by the transition temperatures of their major metabolites. Interplay between saturated and unsaturated fatty acids is also observed. Hence, our study sheds light on cellular membrane biophysics by underscoring the nonequilibrium metabolic status of living cell.

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