湍流对截断光束瑞利区间的影响  

Influence of Turbulence on the Rayleigh Range of Truncated Beams

作　　者：王宇峰[1] 陈晓文[1] 汤明玥[2] 

机构地区：[1]川北医学院医学影像学院,四川南充637000 [2]川北医学院基础医学院物理教研室,四川南充637000

出　　处：《西华师范大学学报（自然科学版）》2016年第2期214-217,共4页Journal of China West Normal University(Natural Sciences)

基　　金：四川省教育厅资助项目(12ZB048;13ZB0244)

摘　　要：推导出截断光束在自由空间和湍流中的瑞利区间表达式,并研究了光束参数和湍流强度对瑞利区间的影响。研究发现,湍流中瑞利区间随湍流强度的增大而逐渐减小。另一方面,不论在自由空间还是湍流中,瑞利区间都随相干参数β和δ截断参数的增大而增大。β和δ取较小值时,湍流对瑞利区间的影响可以忽略不计;而随β和δ的增大,湍流对瑞利区间的影响逐渐增大。Using the extended Huygens-Fresnel principle and integral transform technique,the expressions for the Rayleigh range of truncated beams propagating through free space and turbulence are derived,and the influence of the beam parameters and turbulence parameters on the Rayleigh range is studied. It finds that Rayleigh range in turbulence decreases with increasing intensity of turbulence. On the other hand,Rayleigh range increases with increasing coherence parameter and truncation parameter,either in free space or turbulence. When the value of or is small,the influence of turbulence on the Rayleigh range can be omitted; but the influence of turbulence on the Rayleigh range increases with increasing of and.

关 键 词：截断光束 瑞利区间 湍流 截断参数 

分 类 号：O436.3[机械工程—光学工程] TN012[理学—光学]