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Investigation of amplification process on the third Stokes line of H_(2) under ultraviolet laser irradiation

机译：紫外激光照射下H_（2）第三斯托克斯线的扩增过程研究

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An amplification process was investigated in the third stimulated Raman scattering (SRS) line of H_(2) excited with a 266 nm laser beam generated from the fourth harmonic of a Nd:YAG laser. The unexpected intensity enhancement observed at the third Stokes SRS line around 397.8 nm is attributed to the seeding of the self-generated H-epsilon Balmer line at 397 nm of atomic hydrogen by pumping the H_(2) molecule with a high-energy laser pulse at 266 nm. It is worth mentioning that in our case the SRS spectrum of H_(2) showed a quite different intensity pattern from the usual SRS spectra of hydrogen. The pulse energy and pressure dependence of all the SRS lines in general and the third Stokes SRS line in particular were investigated, and in all respects the amplified SRS line at 397.8 nm manifested completely different characteristics that have not been reported in previous publications. The conversion efficiency (CE) of all the SRS lines in the hydrogen 266 nm SRS spectrum was also estimated, and 36percent CE was achieved at the 397.78 nm line. To support our claim for amplification at the third Stokes line by seeding of the H-epsilon Balmer line of atomic hydrogen, a comparative study was also carried out by pumping hydrogen gas with 355 nm (less energy per photon) and 266 nm laser beams. It is worth noting that amplification of the third Stokes SRS line was observed only with the 266 nm pump laser, where dissociation of H_(2) and excitation of atomic hydrogen take place, and not with the 355 nm pump laser.
机译：在N_：YAG激光器的四次谐波产生的266 nm激光束激发的H_（2）的第三受激拉曼散射（SRS）线中研究了放大过程。在第3个Stokes SRS线（约397.8 nm处）观察到的出乎意料的强度增强归因于通过用高能激光脉冲泵浦H_（2）分子在397 nm原子氢处自生H-εBalmer线的晶种在266 nm。值得一提的是，在我们的案例中，H_（2）的SRS光谱显示出与氢的常规SRS光谱完全不同的强度模式。总体上研究了所有SRS线，特别是第三条Stokes SRS线的脉冲能量和压力依赖性，并且在所有方面，在397.8 nm处放大的SRS线表现出完全不同的特性，以前的出版物中未曾报道过。还估计了266 nm氢SRS光谱中所有SRS谱线的转换效率（CE），在397.78 nm谱线上获得了36％的CE。为了支持我们的第三条斯托克斯线通过氢原子的H-εBalmer线的晶种进行放大的主张，还通过泵送355 nm（每个光子能量更少）和266 nm激光束的氢气进行了比较研究。值得注意的是，仅在266 nm泵浦激光器中观察到第三斯托克斯SRS线的放大，在266 nm泵浦激光器中发生了H_（2）的解离和原子氢的激发，而在355 nm泵浦激光器中未观察到。

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