Effect of laser intensity on temporal and spectral features of laser generated acoustic shock waves: ns versus ps laser pulses

Manikanta E.; Kumar L. Vinoth; Leela Ch.; Kiran P. Prem

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Effect of laser intensity on temporal and spectral features of laser generated acoustic shock waves: ns versus ps laser pulses

机译：激光强度对激光产生声响冲击波的时间和光谱特征的影响：NS与PS激光脉冲

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Evolution of acoustic shock wave (ASW) properties generated during nanosecond (ns) and picosecond (ps) laserinduced breakdown (LIB) of atmospheric air at different input intensities is presented. The intensity is varied by changing the focal geometry of ns and ps pulses. The ASW pressures are observed to follow the dynamic interplay between the plasma density and recombination of plasma species. The conversion of laser energy to acoustic energy has increased from loose to tight focusing conditions. The central frequencies have moved toward the lower side with increasing laser intensities for both ns-LIB (76-48 kHz) and ps-LIB (111.2-92.1 kHz). The angular distribution of acoustic emissions was observed to follow the laser-induced plasma spark in both ns-and ps-LIB. (C) 2017 Optical Society of America

机译：介绍了在不同输入强度下纳秒（NS）和PICOSECOND（PS）和PICOSECOND（PS）和PICOSECOND（PS）激光（PS）产生的声冲击波（ASW）性质的演变。通过改变NS和PS脉冲的焦距来改变强度。观察ASW压力以遵循等离子体物种的等离子体密度和重组之间的动态相互作用。激光能量转换为声能量从松动到紧密的聚焦条件增加。中央频率已经朝向下侧移动，随着NS-LIB（76-48 kHz）和PS-lib（111.2-92.1kHz）的激光强度增加。观察到声排放的角度分布以遵循NS-and PS-Lib中的激光诱导的等离子体火花。（c）2017年光学学会

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《Applied optics》 |2017年第24期|共9页
作者
Manikanta E.; Kumar L. Vinoth; Leela Ch.; Kiran P. Prem;
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Univ Hyderabad ACRHEM Hyderabad 500046 Andhra Prades India;

Univ Hyderabad ACRHEM Hyderabad 500046 Andhra Prades India;

Univ Hyderabad ACRHEM Hyderabad 500046 Andhra Prades India;

Univ Hyderabad ACRHEM Hyderabad 500046 Andhra Prades India;

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Effect of laser intensity on temporal and spectral features of laser generated acoustic shock waves: ns versus ps laser pulses

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