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摘要: 根据拍摄1.06 m长脉冲钕玻璃激光与LY12铝靶耦合产生蒸汽羽的干涉分幅照片，测出在t50 s空气冲击波速度约为473 m/s而蒸汽羽阵面扩散速度约为162 m/s。运用蒸汽羽等离子体的有关热力学特性方程组，得到蒸汽羽等离子体的电子密度、电子温度、电离度和吸收系数的最大值分别为Ne3.11017 cm-1，T6 096 K，0.014，(1.06m)0.03 cm-1的结果。Abstract: Characterizations of the vapor plume from LY12 aluminum target irradiated by a focused normal mode pulsed Nd: glass laser beam have been studied by using of a plate shearing interferometer and the high speed photography. The frame photos show that the speed of shock wave in the air is bout 473 m/s, the vapor plume front is about 162 m/s. By using the Abel inversion and Saha equations to analyze the interferogram of the vapor plume, based on electron density is deduced to be about 3.11017 cm-1, the temperature about 6 096 K, iconicity about 0.014, and optic absorption about 0.03 cm-1.
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Key words:
- laser interaction with materials /
- plasma diagnose
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Bradly J W. AIAA J, 1968, 6(6): 1190. Maher W E, Hall R B. J Appl Phys, 1975, 46(2): 762. 孙承纬. 强激光引起材料和结构破坏的机理分析. 见: 激光与材料相互作用的热和力学效应学术会. 上海, 1991. 袁永华, 等. 高压物理学报, 1990, 4(2): 114-116. 布克D L. 等离子体物理常数和公式手册. 北京: 原子能出版社, 1984. Offenberger A A, et al. J Appl Phys, 1972, 43(2): 574-577. 刘常龄, 等. 强激光与粒子束, 1990, 2(3): 366-371. -
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