粗糙度与激光强度分布对光船聚焦性能的影响

激光束聚焦性能研究是激光推进技术研究中的一个重要内容。根据实验装置的形状和激光强度分布,建立了计算模型,编写了计算程序。用该程序可通过计算空间某点的激光能流密度和某个区域的能流密度分布来确定点火线的形状和点火区域的大小;研究喷管内壁的表面粗糙度和入射激光束的强度分布对聚焦性能的影响。为进一步研究激光支持等离子体流场特性和脉冲激光推进性能等提供重要的理论依据。

Influence of the Wall Roughness and the Intensity Distribution of the Incident Laser on the Focusing Characteristics of Lightcraft

The study of the focusing characteristics of laser beam is an important content in the study of laser propulsion technology. Based on the shape of the experimental setting and the laser intensity distribution, a computational model is established and a program is compiled. By calculating the laser energy flux of some point and the energy flux distribution of some region using the program, the shape of the ignition curve and the size of the ignition region can be determined, and so the influence of the surface roughness of the inner wall of the nozzle and the energy distribution of the incident laser beam on the focusing characteristics can be studied. All of these provide an important theoretical basis for further study of the characteristics of laser sustained plasma flow field and the pulsed laser propulsion experiment.