摘要
采用Andrews修正谱(M谱),通过解析分析与数值计算研究了相干双曲余弦高斯光束在自由空间和中强度大气湍流中传输时瑞利区间的影响因素。研究表明,大气湍流中激光束的瑞利区间明显小于在自由空间的瑞利区间;相干参数α、光束参数β、大气湍流内尺度l0及束腰宽度ω0的增加均利于激光束瑞利区间ZR的增大,而光束波长λ的增大及湍流强度C2n的增强将导致瑞利区间ZR的减小;此外瑞利区间ZR受湍流外尺度L0变化的影响较小,而受湍流内尺度l0变化的影响较大,表现出明显的尺寸效应。相关结果与相同条件下运用Von Karman谱计算得出的结论相一致。
The influences of turbulent atmosphere on the Rayleigh range are studied by analytical and numerical calculation with Andrews modified fluctuation spectrum（ or M spectrum） when coherent cosh-Gaussian beams transfer both in free space and in atmospheric turbulence. The results show that the Rayleigh ranges in turbulent atmosphere are less than that in free space. The Rayleigh range ZRincreases with the increase of the beam coherence parameter α,the beam parameter β,the inner size of atmospheric turbulence l0 and the Gaussian waist width ω0,while decreases with the increase of the wave length λ and the turbulent strength C2 n. It is also showed that the Rayleigh range ZRis affected significantly by the inner size of atmospheric turbulence l0 while it is affected little by the outer size of atmospheric turbulence L0,hence the size effect appears. The results are consistent with what is derived with the Von Karman fluctuation spectrum under the same condition.
出处
《激光与红外》
CAS
CSCD
北大核心
2015年第11期1355-1359,共5页
Laser & Infrared
基金
总参谋部信息化部通信指挥装备军内科研基金(No.KYLYZXJK140002)资助
关键词
瑞利区间
高斯光束
大气湍流
Andrews修正谱
Von
Karman谱
Rayleigh range
Gaussian beam
atmospheric turbulence
Andrews modified fluctuation spectrum
Von Karman fluctuation spectrum
作者简介
王慧（1981-），男，讲师，主研领域为激光传输理论。E-mail：wanghuinj@foxmail．com
