Highly transient stimulated Raman scattering on high- and low-frequency phonon resonances of a Sr0.9Ba0.1MoO4 crystal
Kochukov Yu. А. 1,2, Gubina K. А. 1,2, Tereshchenko D. P. 1, Papashvili A. G. 1, Shukshin V. Е. 1, Voronina I. S. 1, Ivleva L. I. 1, Ushakov A. А. 1, Bulgakova V. V. 1, Chizhov P. А. 1, Smetanin S. N. 1,2
1Prokhorov General Physics Institute of the Russian Academy of Sciences, Moscow, Russia
2National University of Science and Technology MISiS, Moscow, Russia
Email: axiniy@list.ru
An investigation of stimulated Raman scattering (SRS) in a crystal of a Sr0.9Ba0.1MoO4 cationic solid solution under subpicosecond laser pumping with pulse energy of 20 μJ and duration 0.25-6 ps with a controllable chirp is presented. Highly transient SRS with combined (high- and low-frequency) shifts and a small wavelength spacing not only in Stokes, but also anti-Stokes spectral region is observed due to increasing the integral scattering cross section for the secondary low-frequency Raman mode than for the primary high-frequency Raman mode in comparison with an initial SrMoO4 crystal. Under optimum conditions, the first-order Stokes output pulse energy has reached 2.1 and 2.2 μJ with a supercontinuum part of 9% and 30% for high- and low-frequency shifts respectively. Analysis of spectral and temporal structure of output SRS radiation showed stronger influence of competitive nonlinear phenomena of self- and cross-phase modulation on SRS with the low-frequency shift. With negative chirping of the pump pulse, a sharp compression of the pulse of the first-order Stokes component with a low-frequency shift (up to 2.77 times) occurred with an abnormal shift of its spectral line to the short-wave region in comparison with the first Stokes component with the high-frequency shift. Keywords: stimulated Raman scattering, highly transient regime, solid solution, pulse duration, self-phase modulation, cross-phase modulation.
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