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利用Nd:YAG激光器产生的1064 nm激光束(光斑直径为100μm,脉冲能量为60 m J,脉冲宽度为200 ps)聚焦击穿大气形成激光大气等离子体。采用全息干涉技术对激光击穿空气等离子体的电子密度分布进行了诊断,获得的无限宽条纹图直观反映了位移量的等位线,从有限宽条纹图获得了电子密度的分布,结果表明激光大气等离子体中各种离子和电子呈橄榄形分布,即沿激光束方向不对称,而垂直激光束方向对称分布,且最大电子密度为1018cm-3量级。
A 1064 nm laser beam (spot diameter of 100 μm, pulse energy of 60 m J, pulse width of 200 ps) produced by a Nd: YAG laser was used to focus the breakdown atmosphere to form a laser atmospheric plasma. The holographic interference technique was used to diagnose the electron density distribution of laser breakdown air plasma. The obtained infinitely wide stripe pattern directly reflects the displacement line and the distribution of electron density from the finite width stripe pattern. The results show that laser Atmospheric plasma ions and electrons were olive-shaped distribution, that is, along the direction of the laser beam asymmetric, while the vertical direction of the laser beam symmetrical distribution, and the maximum electron density of 1018cm-3 order of magnitude.