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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...
Thermal lens measurements of different aqueous electrolyte solutions have been recorded over the temperature range -10°C-25°C which show major shifts in the temperature of maximum refractive index for each solution. A theoretical investigation of the thermal lens signals with respect to the structure of water reveals that the origin of these observed changes is dependent upon the expansion coefficient...
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