截断光束在湍流中传输的光束质量

基于广义惠更斯-菲涅耳原理,推导出截断光束在湍流中的束宽解析表达式,并近似求解了湍流距离的表达式。利用光束束宽及湍流距离,研究了湍流对截断光束的光束质量的影响。研究发现截断光束在湍流中的扩展随传输距离的增大而增大。此外,湍流距离zT随截断参数啄和相干参数琢的增大而减小,即啄和琢越大,湍流对光束扩展的影响则越大,光束质量越差。本文对主要结果给出了相应的物理解释。

Beam quality of truncated beam propagating through turbulence

Based on the extended Huygens-Fresnel principle, the expression for the mean-squared width of trun_cated beam propagating through atmospheric turbulent is derived, and the expression of turbulence distance is derived by under certain condition. The influence of turbulence on the beam quality is studied by using beam width and turbu_lence distance. It finds that turbulence distance zT decreases with increasing δand α, it means that the larger δandαare, the more truncated GSM beams are affected by turbulence, and the worse beam quality is. The main results ob_tained in this paper are explained physically.