Threshold laser power density for regime transition of a laser absorption wave in a reduced-density air atmosphere
Threshold laser power density for regime transition of a laser absorption wave in a reduced-density air atmosphere
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低密度空气气氛中激光吸收波状态转变的阈值激光功率密度
DOI：
10.1063/1.2183812
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发表时间：
2006
影响因子：
4
通讯作者：
Y. Arakawa
中科院分区：
文献类型：
--
作者：
K. Mori;K. Komurasaki;Y. Arakawa
Shadowgraph可视化实验提供了测量阈值激光功率密度（Sth）的政权过渡的激光吸收波产生的使用横向激发大气CO2脉冲激光与各种脉冲形状。结果显示了很大的影响的等离子体膨胀在横向上的波的传播上的政权过渡的阈值成比例地增加的倒数的束横截面半径在发生过渡（RF，TR）：Sth=Cth scinrf，TR。比例常数Cth对0.2-1.3kg scinm 3的空气密度不敏感。
Shadowgraph visualization experiments provide measurements of the threshold laser power density (Sth) for the regime transition of a laser absorption wave generated using a transversely excited atmospheric CO2 pulse laser with various pulse shapes. Results revealed a great influence of the plasma expansion in the direction lateral to the wave propagation on the regime transition by showing that the threshold increased proportionally to the inverse of the beam cross-sectional radius at which the transition occurred (rf,tr): Sth=Cth∕rf,tr. The proportionality constant, Cth, was insensitive to air densities of 0.2–1.3kg∕m3.