脉冲激光作用下气溶胶导致大气击穿研究
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摘要: 利用锁模Nd:YAG激光及其倍频激光照射漂浮在大气中的Al2O2、ZnO、ZrO2、18号玻璃粉等气溶胶粒子，在不同光学参数下对光致大气击穿阈值进行了测量。测量结果表明：空气中含较大粒子(d >30 μm)的光致击穿阈值比含较小粒子(d <1μm)的空气击穿阈值低2~3个数量级；含杂空气的击穿阈值随入射激光束直径的增大而下降，随气溶胶粒子直径的增大而减小，且随气溶胶成份的不同而不同；光致击穿阈值随波长的减小而增大。
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关键词:
- 空气击穿 /
- 阈值 /
- 气溶胶粒子 /
- 倍频Nd:YAG脉冲激光
Abstract: Aerosol-induced laser breakdown thresholds has been discussed in different optic parameter or in different micro-meter sized particles using a mode-locked Nd:YAG laser with 123.61ps pulse duration irradiates aerosol particles (Al2O3、ZnO、ZrO2、18th glass) that are suspended in air. Following results are obtained:breakdown thresholds for aerosol particles (d >30m m) are 2~3 order of magnitude below those for clean air (d >1m m). Air breakdown threshold is lower as laser radius increasing or aerosol particle size increasing. The threshold depends on particles composition The threshold is higher as laser wavelength decreasing.-
Key words:
- air breakdown /
- threshold /
- aerosol /
- frequency-doubled nd:yag pulsed laser.
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