摘要
以波长为1.06μm的强激光束辐照金平面孔靶,在小孔边缘激光功率密度I为8.3×10^(12)Wcm^2—4.8×10^(13)W/cm^2条件下,由高速摄影获得的堵口图象,推得堵口速度c_T为4.5×10^(?)cm/s—1.0×10^(?)cm/s,定标式为c_T=101(?)。还研究了时间积分的能量透过率。它依赖于小孔直径、激光脉宽和激光能量等。实验还发现,孔靶等离子体X光辐射时间呈双峰特征、空间分布出现 形状的图象。
A set of gold planar pinhole targets were irradiated with1.06μm Nd: glass laser pulse. I, the laser power density at pinhole edge,was from 8. 8 × 1012 W/cm2 to 4. 8 × 1013 W/cm2. According to a lot of high speed photography images of closure effect, the closure speed c1 was inferred to be in the range of 4. 5 × 106 to 1.0× 107cm/s with a scaling formula of c1=10 I0.3. Also, the ratios of the laser energy transmitted through pinholeswere investigated, as a function of hole diameter, laser pulse duration, laser energy and .so on. In addition , it was discovered that the x rays radiated from the pinhole plasmas, showed double - Peaked temporal profiles and o - like spatial distribuctions .
出处
《强激光与粒子束》
EI
CAS
CSCD
1989年第3期248-252,共5页
High Power Laser and Particle Beams
关键词
平面孔靶
激光
等离子体
堵口
laser plasma closure, closure speed, energy transmissivity.
