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Frequency mixing in boron carbide laser ablation plasmas

机译：碳化硼激光烧蚀等离子体中的频率混合

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摘要

Nonlinear frequency mixing induced by a bichromatic field (1064 nm + 532 nm obtained from a Q-switched Nd:YAG laser) in a boron carbide (B4C) plasma generated through laser ablation under vacuum is explored. A UV beam at the frequency of the fourth harmonic of the fundamental frequency (266 nm) was generated. The dependence of the efficiency of the process as function of the intensities of the driving lasers differs from the expected behavior for four-wave mixing, and point toward a six-wave mixing process. The frequency mixing process was strongly favored for parallel polarizations of the two driving beams. Through spatiotemporal mapping, the conditions for maximum efficiency were found for a significant delay from the ablation event (200 ns), when the medium is expected to be a lowionized plasma. No late components of the harmonic signal were detected, indicating a largely atomized medium. (C) 2014 Elsevier B.V. All rights reserved.
机译：探索了在真空下通过激光烧蚀产生的碳化硼（B4C）等离子体中的双色场（从Q开关Nd：YAG激光器获得的1064 nm + 532 nm）引起的非线性混频。产生处于基频的第四谐波频率（266nm）的UV束。过程效率与驱动激光强度的函数关系与四波混合的预期行为不同，指向六波混合过程。对于两个驱动光束的平行偏振，强烈建议使用混频过程。通过时空映射，可以发现最大效率的条件是从消融事件（200 ns）开始有明显的延迟，此时介质应为低电离血浆。未检测到谐波信号的后期分量，表明介质已大量雾化。 （C）2014 Elsevier B.V.保留所有权利。

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