环状光束在大气湍流中的传输特性  

Propagation Properties of Annular Beams in Atmospheric Turbulence

作　　者：张帅[1] 乔娜[1] 张彬[1] 但有全[1,2] 

机构地区：[1]四川大学电子信息学院,四川成都610064 [2]中国民航飞行学院物理教研室,四川广汉618307

出　　处：《光学学报》2010年第11期3103-3109,共7页Acta Optica Sinica

基　　金：教育部新世纪优秀人才支持计划(NCET-05-0784)资助课题

摘　　要：基于广义惠更斯-菲涅耳原理,利用Rytov近似理论,推导出环状光束在湍流大气介质中光强分布的解析表达式。在此基础上,根据强度二阶矩定义,推导出环状光束在大气湍流中传输的M2因子的表达式。最后,详细讨论了环状光束在湍流介质中的传输变换特性及其光束质量变化。研究结果表明,环状光束在湍流介质中传输时,湍流的强弱直接影响着环状光束传输变换的程度和快慢。由于湍流的影响,环状光束在传输过程中由完全相干光变成部分相干光。环状光束在湍流中传输的M2因子与光束遮拦比、湍流强度、光束波长以及传输距离有关。选择合适的光束遮拦比和波长等光束参数,可以有效地控制激光束在湍流介质中传输的光束质量。Based on the extended Huygens-Fresnel principle and the Rytov approximate theory,analytical expressions for intensity distribution of annular beams through turbulent atmosphere have been derived.Then,according to the definition of the second-order moments of intensity,an analytical formula of M2 factor for annular beams propagating in atmospheric turbulence has been derived.Finally,the propagation properties and the changes of beam quality of annular beams through the turbulent atmosphere have been discussed in detail.The results indicate that the propagation and transformation of the annular beams through the turbulent atmosphere have been directly affected by the intensity of the turbulence.Due to the effect of the turbulence,the annular beams turn from completely coherent beams into partially coherent beams in the propagation process.The M2 factor of the annular beams depends on the obstruction ratio,the turbulence intensity,the beam wavelength and the propagation distance.By using a suitable choice of the beam parameters,such as the obstruction ratio and the wavelength of annular beams,the beam quality of annular beams in atmospheric turbulence could be effectively controlled.

关 键 词：大气光学 环状光束 大气湍流 传输特性 光束质量 M2因子 

分 类 号：O436[机械工程—光学工程]