复宗量厄米双曲余弦高斯光束在湍流大气中的传输特性

Propagation Properties of Elegant Hermite-Coch-Gaussian Beams in a Turbulent Atmosphere

根据广义的惠更斯-菲涅耳原理,推导了复宗量厄米双曲余弦高斯(EHChG)光束在湍流大气中传输时光强分布的理论公式,并研究光束在湍流大气中的传输变化规律.研究发现,EHChG光束在湍流大气中传输时,光强分布均趋于高斯分布.在湍流大气的影响下,EHChG光束由完全相干光变成部分相干光,并且随着传输距离和湍流强度的增加,光束的空间相干性变差.研究还发现,光束的桶中功率与湍流大气的强度、传输距离及光束参数m,n有关.

Based on the extended Huygens-Fresnel principle,the theoretical formula of the optical intensity distribution for an Elegant Hermite-cosh-Gaussian（EHChG） beams which propagate in a turbulent atmosphere has been derived,and then the propagation properties of such beam in the turbulent atmosphere have been investigated in detail.It is found that the intensity distribution of EHChG beams will approach to a Gaussian profile after propagating in the turbulent atmosphere.It is also found that a coherent EHChG beam will change into a partially coherent one at the influence of the turbulent atmosphere,and the coherence of beams is getting worse for a longer propagation distance or a stronger atmospheric turbulence.In addition,the power in bucket（PIB） of the EHChG beams has been discussed.It is shown that the PIB of the EHChG beam propagating in turbulent atmosphere is related with the the intensity of the atmospheric turbulence,the propagation distance,and the beam parameter m and n.