Abstract

Spectral broadening of 0.3 ps 515 nm laser pulse in a highly Raman-active $\rm BaWO_{4}$ crystal and fused silica demonstrates significantly different behavior with the incident pulse energy. While the broadening in fused silica is fairly symmetric with respect to the pump laser pulse wavelength, the Stokes wing broadening in the $\rm BaWO_{4}$ crystal is 2 times wider than that of anti-Stokes wing, the former demonstrating a step-like increase with the pulse energy. To the best of our knowledge, the obtained data are the first clear evidences of the following facts: (i) stimulated Raman scattering with sufficiently high efficiency of conversion to Stokes components slows down spectral broadening induced by self-phase modulation, and (ii) the mechanism of Kerr nonlinearity, which is responsible for self-phase modulation in ${{\rm BaWO}_4}$, is of orientational nature. The nonlinear refraction coefficient and its decay time following from our experiments with ${{\rm BaWO}_4}$ were estimated as ${{n}_{2}} \approx {6.4.{10}^{- 15}}\;{{\rm cm}^2}/{\rm W}$ and ${\tau _{\rm NL}} \approx {0.35}\;{\rm ps}$.

© 2021 Optical Society of America

Highly efficient stimulated Raman scattering of sub-picosecond laser pulses in BaWO₄ for 10.6 µm difference frequency generation

I. O. Kinyaevskiy, V. I. Kovalev, P. A. Danilov, N. A. Smirnov, S. I. Kudryashov, L. V. Seleznev, E. E. Dunaeva, and A. A. Ionin
Opt. Lett. 45(8) 2160-2163 (2020)

Multiwavelength, picosecond, synchronously pumped, Pb(MoO₄)_0.2(WO₄)_0.8 Raman laser oscillating at 12 wavelengths in a range of 1128–1360 nm

Milan Frank, Sergei N. Smetanin, Michal Jelínek, David Vyhlídal, Ksenia A. Gubina, Vladislav E. Shukshin, Petr G. Zverev, and Václav Kubeček
Opt. Lett. 46(20) 5272-5275 (2021)

Near-quantum-limit efficiency of picosecond stimulated Raman scattering in BaWO₄ crystal

Pavel Černý and Helena Jelínková
Opt. Lett. 27(5) 360-362 (2002)

Highly efficient picosecond all-solid-state Raman laser at 1179 and 1227  nm on single and combined Raman lines in a BaWO₄ crystal

Milan Frank, Sergei N. Smetanin, Michal Jelínek, David Vyhlídal, Lyudmila I. Ivleva, Petr G. Zverev, and Václav Kubeček
Opt. Lett. 43(11) 2527-2530 (2018)

Modulation instability induced by cross-phase modulation of transient stimulated Raman scattering and self-phase modulation in calcite

Shah Faisal B. Mazhar and Robert R. Alfano
Opt. Lett. 45(11) 3167-3170 (2020)