高功率斜入射激光与高Z靶耦合非局域吸收的理论模型

THEORETICAL MODEL TO NON-LOCATION ABSORPTION FOR OBLIQUELY INCIDENT HIGH POWER LASER COUPLING WITH HIGH Z TARGETS

激光聚变的理论和实验研究是一项综合性的应用研究.为了弄清激光靶耦合的物理规律,作各种分解研究是很有必要的.在激光间接驱动内爆研究中,要求激光以某一角度进入黑洞靶中与靶相互作用.作为一个分解问题,本文在几何光路近似和一维密度分布的假定下对钕玻璃激光与金(Au)平面靶耦合的吸收作了自洽这这的数值计算,通过结果分析给出了激光吸收效率随激光入射角、强度和波长的变化规律,同时还给出激光吸收区电子温度、X射线转换效率随激光入射角的变化规律.模型计算值与国内外已发表的理论和实验结果作了比较,其定性趋势和定量结果都不同程度地符合.

With the assumption of 1-D density distribution and geometric light path,the absorption coupling Nd-glass laser with Au targets have been computed consistently; the variation laws of laser absorption efficiency with incident angle, intensity, and wavelength are given by analysis of the results, the variation laws of electron temperature in the region of laser absorption and X-ray convesion efficiency with incident angle are also given. The results computed with the model have been compared to the experimental results good agreement has been found.