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首页> 外文期刊>Physics of plasmas >Raman upshifted third harmonic generation of a laser in a plasma
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Raman upshifted third harmonic generation of a laser in a plasma

机译：拉曼提高了等离子体中激光的三次谐波产生

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摘要

The plasma wave produced in a stimulated Raman back scattering process in plasma is seen to be effective in the resonant Raman upshifted third harmonic generation of the same laser or of another laser of a slightly lower frequency. The process requires plasma density slightly lower than the quarter critical density corresponding to the first laser frequency. The electron density perturbation due to the plasma wave beats with the drift velocity imparted by the second harmonic ponderomotive force to produce a density perturbation at Raman upshifted second harmonic. This perturbation couples with the oscillatory electron velocity due to the laser to produce Raman upshifted third harmonic current density and radiation field. The phase matching condition in cold plasma is satisfied when a plasma density is quarter critical. Thermal effects lower the requisite electron density a bit. The energy conversion efficiency from the pump to the Raman upshifted third harmonic could be quite large when the laser intensity exceeds 10~(16) W/ cm~2. The plasma inhomogeneity, however, is a significant limiting factor.
机译：可以看出，在等离子体中的受激拉曼反向散射过程中产生的等离子体波在同一激光器或频率稍低的另一激光器的共振拉曼上移三次谐波产生中是有效的。该过程要求等离子体密度略低于对应于第一激光频率的四分之一临界密度。由等离子体波引起的电子密度扰动以二次谐波质动力所赋予的漂移速度跳动，从而在拉曼上移的二次谐波处产生密度扰动。这种扰动与激光产生的振荡电子速度耦合，产生拉曼上移的三次谐波电流密度和辐射场。当等离子体密度为四分之一临界值时，满足冷等离子体中的相位匹配条件。热效应会稍微降低所需的电子密度。当激光强度超过10〜（16）W / cm〜2时，从泵浦到拉曼上移的三次谐波的能量转换效率可能会非常高。但是，血浆不均匀性是一个重要的限制因素。

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