Geints Yurii E, Zemlyanov Alexander A, Kabanov Andrey M, Bykova Elena E, Apeksimov Dmitrii V, Bukin Oleg A, Sokolova Ekaterina B, Golik Sergey S, Ilyin Aleksey A
Zuev Institute of Atmospheric Optics, Siberian Branch of the Russian Academy of Sciences, Tomsk, Russia.
Appl Opt. 2011 Sep 20;50(27):5291-8. doi: 10.1364/AO.50.005291.
We report on the experiments on the interaction of gigawatt femtosecond laser pulses with suspended millimeter-sized water droplets. The transparent droplets experienced laser-induced breakdown and explosive boiling up and emitted a broadband radiation. This radiation covers the spectral range from 450 to 1100 nm and consists of the spectrum of laser pulse scattered and transformed by the droplet due to self-phase modulation and plasma emission produced in water during photoionization. The droplet emission spectrum showed remarkable broadening at all viewing angles and is maximal in the direction of the laser exit from the droplet. The enlargement of the droplet results in additional spectral spreading of the emitted radiation. The depth and amount of laser pulse spectral self-transformations upon propagation through the water droplet are simulated by means of numerical calculations.
我们报告了关于千兆瓦飞秒激光脉冲与悬浮的毫米级水滴相互作用的实验。透明水滴经历了激光诱导的击穿和爆炸沸腾，并发射出宽带辐射。这种辐射覆盖了从450到1100纳米的光谱范围，由由于自相位调制和光电离过程中在水中产生的等离子体发射而被水滴散射和变换的激光脉冲光谱组成。水滴发射光谱在所有视角下都显示出显著的展宽，并且在激光从水滴射出的方向上最大。水滴尺寸的增大导致发射辐射的额外光谱展宽。通过数值计算模拟了激光脉冲在穿过水滴传播时光谱自变换的深度和程度。
