摘要
继用高速摄影技术对自由振荡钕玻璃激光与Ly12铝靶相互作用产生的蒸汽羽的传播及其特性进行研究之后,又定量研究了它的吸收屏蔽效应。实验表明,在0.7～1.6×10~7W/cm^2的激光功率密度下,其光学厚度最高可达1.2。蒸汽羽等离子体对入射激光的吸收与辐照靶的功率密度成正比,在距靶面3mm处比9mm处吸收强。实验获得了吸收随序列尖峰脉冲时间的变化曲线。
Propagation and properties of vapor plume plasmas generated by Nd : Glass laser pulses interacting with Ly12 aluminum targets were investigated with high speed photograph technigue, and then the sheilding effects of absorption were studied. Experiments show that the optical thickness is up to 1.2 for power densities between 0.7 × 107W/cm2 and 1.6×107W/cm2. The absorption of vapor plume plasmas is proportional to the incident laser intensity, and the absorption curve vs time of peak pulse was abtained experimentally. The absorptivity is greater at 3mm apart from the target surface than at 9mm.
出处
《强激光与粒子束》
EI
CAS
CSCD
1990年第3期366-371,共6页
High Power Laser and Particle Beams
关键词
蒸汽羽
等离子体
激光
吸收
屏蔽
pulsed Nd: Glass laser, plasma sheild, optical thickness, absorption coefficient
