I. O. Kinyaevsky, A. V. Koribut, I. V. Gritsenko, A. M. Sagitova, M. V. Ionin, E. E. Dunaeva, A. A. Ionin, “Influence of focusing on transient SRS self-seed by SPM of 0.3 ps laser pulses in a BaWO<nobr>$_4$</nobr> crystal”, Optics and Spectroscopy, 2023, Volume 131, Issue 2,Pages <nobr>202

This article is cited in 1 paper

International Conference "Ultrafast Optical Phenomena" (UltrafastLight-2022), October 03-07, 2022, Moscow
Nonlinear optics

Influence of focusing on transient SRS self-seed by SPM of 0.3 ps laser pulses in a BaWO$_4$ crystal

I. O. Kinyaevsky^a, A. V. Koribut^a, I. V. Gritsenko^a, A. M. Sagitova^a, M. V. Ionin^a, E. E. Dunaeva^b, A. A. Ionin^a

^a P. N. Lebedev Physical Institute, Russian Academy of Sciences, 119991 Moscow, Russia
^b Prokhorov General Physics Institute of the Russian Academy of Sciences, 119991 Moscow, Russia

Abstract: The effect of focusing, taking into account self-focusing, on the interference of SRS (stimulated Raman scattering) and self-phase modulation in a 8 mm BaWO$_4$ crystal pumped by laser pulses with a duration of 0.3 ps and a wavelength of 515 nm is experimentally studied. The maximum efficiency of SRS conversion ($\sim$23%) to the Stokes component of the $\nu_1$ = 925 cm$^{-1}$ strongest mode is obtained with a lens with a focal length of 40 mm at the linear focus shift towards the rear facet of the crystal. The increase in efficiency, when the linear focus is shifted to the rear facet, is associated with an increase in the distance between the linear and nonlinear foci, which results in an increase in the effective length of the nonlinear interaction.

Keywords: stimulated Raman scattering, self-phase modulation, self-focusing, BaWO$_4$, femtosecond pulses.

Received: 20.12.2022
Revised: 13.01.2023
Accepted: 28.01.2023

DOI: 10.21883/OS.2023.02.55006.6-23