Biswas A, Pinnick R G, Xie J G, Ruekgauer T E, Armstrong R L
Opt Lett. 1992 Nov 15;17(22):1569-71. doi: 10.1364/ol.17.001569.
We report the first observations, to our knowledge, of nonlinear optical effects in large (millimeter-sized) droplets. Stimulated Raman scattering (SRS) and laser-induced breakdown (LIB) are simultaneously observed in acoustically levitated millimeter-sized glycerol droplets irradiated by either a frequency-doubled (532-nm) or a frequency-tripled (355-nm) Nd:YAG laser. The two processes, which occur above a nearly coincident irradiation threshold, are conjectured to arise from a common initiation mechanism: self-focusing. LIB generates vapor bubbles within the droplet, resulting in the quenching of SRS emission.
据我们所知，我们首次报道了在大尺寸（毫米级）液滴中观察到的非线性光学效应。在由倍频（532纳米）或三倍频（355纳米）的Nd:YAG激光辐照的声学悬浮毫米级甘油液滴中，同时观察到了受激拉曼散射（SRS）和激光诱导击穿（LIB）。这两个过程发生在几乎重合的辐照阈值之上，据推测是由一个共同的起始机制引起的：自聚焦。LIB在液滴内产生蒸汽泡，导致SRS发射猝灭。
