scholarly journals Stimulated Raman Scattering in Alkali-Earth Tungstate and Molybdate Crystals at Both Stretching and Bending Raman Modes under Synchronous Picosecond Pumping with Multiple Pulse Shortening Down to 1 ps

Crystals ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 167 ◽  
Author(s):  
Milan Frank ◽  
Sergei Smetanin ◽  
Michal Jelínek ◽  
David Vyhlídal ◽  
Vladislav Shukshin ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Raman Line ◽  
Stimulated Raman Scattering ◽  
Low Frequency ◽  
Raman Shift ◽  
Anionic Group ◽  
Alkali Earth ◽  
Bending Mode ◽  
Stimulated Raman ◽  
Synchronously Pumped

Comparative investigation of characteristics of spontaneous and stimulated Raman scattering (SRS) in different alkali-earth tungstate and molybdate crystals at both high and low frequency anionic group vibrations is presented. It has been found that, among these crystals, the SrMoO4 and SrWO4 crystals are the most perspective for SRS generation on both stretching and bending modes of internal anionic group vibrations with the strongest SRS pulse shortening under synchronous laser pumping because of not only highly intense stretching mode Raman line for efficient primary extra cavity long-shifted SRS conversion but also the widest bending mode Raman line for the strongest SRS pulse shortening down to the inverse width of the widest Raman line (~1 ps) at secondary intracavity short-shifted SRS conversion. The strongest 26-fold pump pulse shortening down to 1.4 ps at the Stokes component with the combined Raman shift in the synchronously pumped extra cavity SrMoO4 and SrWO4 Raman lasers has been demonstrated. It was found that synchronously pumped cascade SRS with combined Raman shift is more efficient in the SrWO4 crystal because the bending mode Raman line is more intense relative to the stretching mode Raman line than that in SrMoO4.

scholarly journals Stimulated Raman Scattering in Yttrium, Gadolinium, and Calcium Orthovanadate Crystals with Single and Combined Frequency Shifts under Synchronous Picosecond Pumping for Sub-Picosecond or Multi-Wavelength Generation around 1.2 µm

Crystals ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 871 ◽  
Author(s):  
Milan Frank ◽  
Sergei N. Smetanin ◽  
Michal Jelínek ◽  
David Vyhlídal ◽  
Lyudmila I. Ivleva ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Raman Line ◽  
Stimulated Raman Scattering ◽  
Comparative Investigation ◽  
Anionic Group ◽  
Multi Wavelength ◽  
Homogeneous Broadening ◽  
Bending Modes ◽  
Structural Disordering ◽  
Stimulated Raman

Comparative investigation of stimulated Raman scattering (SRS) characteristics in the YVO4, GdVO4, and Ca3(VO4)2 orthovanadate crystals at both low and high frequency anionic group vibrations is presented. It was found that GdVO4 is the most perspective for SRS generation on both the ν1 stretching and ν2 bending modes of internal anionic group vibrations with the strongest SRS pulse shortening under synchronous picosecond pumping. It is as a result of GdVO4‘s widest linewidth (17cm−1) of the homogeneously broadened scheelite-type component of the bending ν2 Raman line that led to the strongest SRS pulse shortening down to the dephasing time of the widest (scheelite-type) Raman mode at the secondary intracavity short-shifted SRS conversion. It allowed us to achieve SRS pulses with sub-picosecond duration under tens-of-picoseconds pumping due to the strongest 42-fold pulse shortening. Using the Ca3(VO4)2 crystal with essentially wider Raman lines (~50cm−1) did not allow us to generate SRS pulses shorter than 1 ps. It can be explained by inhomogeneous broadening of the Raman lines in Ca3(VO4)2 because of its structural disordering. Using the measured SRS pulse duration, the homogeneous broadening of the inhomogeneously broadened bending Raman line of Ca3(VO4)2 was estimated to be ~9cm−1. Among the orthovanadate crystals, the YVO4 crystal with the highest Raman gain and with homogeneously broadened Raman lines allowed us to realize the most efficient SRS lasing and SRS pulse shortening truly down to inverse half-width of the bending Raman line.

Low-Frequency Stimulated Raman Scattering on Acoustic Vibrations of Dielectric Nanospheres in Aqueous Suspension

2018 ◽  
Vol 45 (6) ◽  
pp. 187-189 ◽  
Author(s):  
A. F. Bunkin ◽  
M. A. Davydov ◽  
V. N. Lednev ◽  
S. M. Pershin ◽  
E. A. Trifonova ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Stimulated Raman Scattering ◽  
Aqueous Suspension ◽  
Low Frequency ◽  
Acoustic Vibrations ◽  
Stimulated Raman

scholarly journals Soliton dynamics in an extended nonlinear Schrödinger equation with a spatial counterpart of the stimulated Raman scattering

2013 ◽  
Vol 79 (6) ◽  
pp. 1057-1062 ◽  
Author(s):  
E. M. GROMOV ◽  
B. A. MALOMED
Keyword(s):  
Schrödinger Equation ◽  
Raman Scattering ◽  
Nonlinear Schrödinger Equation ◽  
Schrodinger Equation ◽  
Stimulated Raman Scattering ◽  
Low Frequency ◽  
Nonlinear Schrodinger Equation ◽  
Nonlinear Schrödinger ◽  
Soliton Dynamics ◽  
Stimulated Raman

AbstractThe dynamics of solitons is considered in the framework of the extended nonlinear Schrödinger equation (NLSE), which is derived from a system of Zakharov's type for the interaction between high-frequency (HF) and low-frequency (LF) waves, in which the LF field is subject to diffusive damping. The model may apply to the propagation of HF waves in plasmas. The resulting NLSE includes a pseudo-stimulated-Raman-scattering (PSRS) term, i.e. a spatial-domain counterpart of the SRS term, which is well known as an ingredient of the temporal-domain NLSE in optics. Also included is inhomogeneity of the spatial second-order diffraction (SOD). It is shown that the wavenumber downshift of solitons, caused by the PSRS, may be compensated by an upshift provided by the SOD whose coefficient is a linear function of the coordinate. An analytical solution for solitons is obtained in an approximate form. Analytical and numerical results agree well, including the predicted balance between the PSRS and the linearly inhomogeneous SOD.

scholarly journals Stimulated Raman scattering in liquid water in a low-frequency region

2012 ◽  
Vol 61 (6) ◽  
pp. 064217
Author(s):  
Li Zhan-Long ◽  
Wang Yi-Ding ◽  
Zhou Mi ◽  
Men Zhi-Wei ◽  
Sun Cheng-Lin ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Liquid Water ◽  
Stimulated Raman Scattering ◽  
Low Frequency ◽  
Frequency Region ◽  
Stimulated Raman

scholarly journals Спонтанное и вынужденное комбинационное рассеяние света в протиевой и дейтериевой воде -=SUP=-*-=/SUP=-

2019 ◽  
Vol 126 (6) ◽  
pp. 765
Author(s):  
В.С. Горелик ◽  
Dongxue Bi ◽  
Ю.П. Войнов ◽  
А.И. Водчиц ◽  
В.А. Орлович ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Fiber Optics ◽  
Stimulated Raman Scattering ◽  
Low Frequency ◽  
Picosecond Laser ◽  
Structural Defects ◽  
Spontaneous Raman Scattering ◽  
Scattering Spectra ◽  
Raman Scattering Spectra ◽  
Stimulated Raman

Comparison of Raman scattering spectra for different samples of protium and deuterium water has been done. Registration of spectra was held with the help of fiber optics technique and BWS465-785H small sized spectrometer. For excitation of spontaneous Raman scattering spectra the continuously working laser (λ=785 nm) has been used. The essential differences of low frequency Raman scattering spectra for different water samples have been observed. Such differences have been explained by the presence of structural defects and imperfections in analyzed water. Stimulated Raman scattering spectra in protium and deuterium water have been observed with excitation by picosecond laser pulses with wavelength 532 nm. Low frequency Raman satellites in Stimulated Raman scattering spectra have been recorded, related to clusters of several water molecules.

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