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气压对激光诱导等离子体辐射特征的影响 被引量:12

The Effects of Ambient Gas Pressure on the Emission Characteristics of Laser-induced Plasmas
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摘要 我们使用Nd:YAG激光器烧蚀金属Al靶获得等离子体,在100Pa~100kPa气压范围内,进行了环境气体压强对激光诱导等离子体辐射特征影响的研究.使用的气体是Ar气,激光能量145mJ.结果发现,最大特征辐射强度在10kPa、靶前0.1mm处、延时180ns获得;而信号-背景是在靶前1.0mm处、延时450ns达到最大值.基于Al等离子体不同气压下的时间-空间分辨谱,对结果进行了简单的讨论. Tile effects of anlbient gas pressure on the emission characteristics of laser-induced plasmas were studied with the use of a Q-switched Nd:YAG laser overa pressure range of 100 Pa to 100 kpa in Argon atmosphere. The laser energywas setup to 145 mJ. The experimental results showed that; the maximum sped,ralintensity occurred at about 10 kpa, 180 ns after laser bearn shot, 0.1 mm fromthe surface. Whereas the line- background reached maximum at the same pressure,450 ns delay, 1.0 mm from the surface. Tile results are discussed briefly on the basisof the time- and space-resolved spectra.
出处 《量子电子学报》 CAS CSCD 1999年第3期237-242,共6页 Chinese Journal of Quantum Electronics
关键词 激光诱导 等离子体 激光烧蚀 原子特征谱 连续谱 laser induced plasma, laser ablation, spectral lines of atom, continuousspectrum
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