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首页> 外文会议>High-Power Laser Ablation VI pt.2 >Absorption waves interaction in gas and plasma
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Absorption waves interaction in gas and plasma

机译：气体和等离子体中的吸收波相互作用

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摘要

Mechanisms of absorption wave of laser radiation and spectral characteristics of laser plasma were investigated at a laser breakdown in a normal atmosphere. Q-switched Nd:YAG laser operated at 1064 and 532 nm were used in experiment. Laser pulse consisted of prepulse and basic pulse for both laser wavelengths. Time interval between pulses was 15 ns, time duration (FWHM) was 4 ns for 532 nm wavelength, 5 ns for 1064 nm wavelength. Molecular emission and collapse of intensity of plasma continuum during the initial moments of laser plasma expansion were registered. It was carried out examination of colliding plasmas interaction which depended on absorption wave mechanism and distance between focal points of lens. The magnification of integrated intensity in case of plasmas interaction is registered. Decay time of continuous spectrum and lines emission was increased thus contrast of emission lines was also increased.
机译：研究了正常环境下激光击穿时激光辐射的吸收波机理和等离子体的光谱特性。实验中使用了在1064和532 nm下工作的Q开关Nd：YAG激光器。激光脉冲由两种激光波长的预脉冲和基本脉冲组成。脉冲之间的时间间隔为15 ns，持续时间（FWHM）对于532 nm波长为4 ns，对于1064 nm波长为5 ns。记录了在激光等离子体膨胀的初始时刻的分子发射和等离子体连续性强度的崩溃。进行了碰撞等离子体相互作用的检查，该碰撞等离子体相互作用取决于吸收波机理和透镜焦点之间的距离。记录了在等离子体相互作用的情况下积分强度的倍率。连续光谱和谱线发射的衰减时间增加，因此发射谱线的对比度也增加。

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