湍流大气中激光束扩展反射效应

Beam spreads upon specular reflection of laser beams in a turbulent atmosphere

本文讨论了激光束在弱湍流大气中传输时平面镜反射回波的光束短期和长期扩展增加效应。结果表明激光回波的光束短期扩展反射放大率近似但大于其长期扩展反射放大率。聚焦光束的长期扩展增强率为1.52,短期扩展的增强率略大于1.52。

An general expressions are derived for the short-term and long-term average optical beam spreads of laser beams, which were reflected by plane mirror, propagating in a weakly inhomogeneous medium. The effects of reflection of the beam spreads have been discussed The results shown the reflacted amplification ratio of the shortterm beam spreads is little more than the amplification ratio of the long-term beam spreads.The amplification coefficient of the long-term beam spreads is 1.52 and the short-term spreads is little more than 1.5 of focused laser beam.