Comparison of stimulated Raman scattering of picosecond pulses in gaseous and solid state media

Pavel Cerny; Helena Jelinkova

doi:10.1117/12.373671

29 December 1999 Comparison of stimulated Raman scattering of picosecond pulses in gaseous and solid state media

Pavel Cerny, Helena Jelinkova

Proceedings Volume 4016, Photonics, Devices, and Systems; (1999) https://doi.org/10.1117/12.373671
Event: Photonics Prague '99, 1999, Prague, Czech Republic

Abstract

Stimulated Raman scattering of picosecond pulses was investigated in gaseous methane and KGd(WO₄)₂ crystal. As a pump source, we used the second harmonic output of a mode-locked Nd:YAG laser system. Pulses of energies up to 20 mJ at 532 nm were used; the pulse length was equal to 41 ps. During the experiment, we measured the characteristics of scattered radiation in each nonlinear material. For gaseous methane at 1 MPa, the threshold pumping intensity was measured to be 110 GW/cm². The first Stokes component and the anti-Stokes lines to the third order were detected. The overall conversion efficiency of 46 percent was obtained. The measured threshold intensity is in good agreement with the transient SRS theory for this medium. The threshold pumping intensity for KGW crystal was measured to be 600 MW/cm². The Stokes components to the third order were observed with the overall conversion efficiency of 50 percent. The SRS gain coefficient of 24 cm/GW was calculated from the obtained results. Comparison of the two investigated materials favors the crystalline Raman shifter because of lower SRS threshold intensity, higher gain, and god mechanical properties.

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Pavel Cerny and Helena Jelinkova "Comparison of stimulated Raman scattering of picosecond pulses in gaseous and solid state media", Proc. SPIE 4016, Photonics, Devices, and Systems, (29 December 1999); https://doi.org/10.1117/12.373671

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