Influence of compressed gas circulation on SRS conversion of ultrashort laser pulses
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Comparative studies on SRS conversion of 1 kHz ultrashort laser pulses (0.9–1.2 ps) at 401 and 802 nm in circulated and non-circulated compressed methane and hydrogen were carried out in SRS generation (SRSG) and stimulated Raman amplification (SRA) modes. It was shown that circulation of the gases weakened substantially the thermal lens, which facilitated reaching higher efficiencies of radiation frequency conversion and improved the quality of the obtained beams. This effect was especially pronounced in SRA mode in methane. In this case, the spectrum of the amplified beam practically coincided with that of the seed (beam to be amplified) and the quality of the first Stokes beam was close to the diffraction limit.
Keywordsstimulated Raman scattering (SRS) SRS generation stimulated Raman amplification conversion efficiency beam quality spectral width compressed gas methane hydrogen thermal lens gas circulation
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