强激光与粒子束, 2013, 25 (9): 2257, 网络出版: 2013-08-28
啁啾脉冲高斯光束在大气湍流中的传输特性
Spectral characteristics of chirped pulsed Gaussian beams propagating in turbulent atmosphere
激光光学 湍流大气 啁啾脉冲 相对频移 光谱强度 laser optics turbulent atmosphere chirped pulse relative frequency shift spectral intensity
摘要
基于广义惠更斯菲涅耳原理,推导出啁啾脉冲高斯光束在湍流大气中传输的光谱解析表达式,并对解析表达式进行了数值仿真。结果表明:啁啾参数越大,光源谱宽越宽;当光源相对谱宽大于0.336时,轴上点光谱产生蓝移;湍流使得轴上点光谱的相对频移量减小,相对频移量随源光谱宽的增大而非线性增大;增大光束束腰半径可减小湍流对光谱频移、光束展宽的影响。
Abstract
Based on the extended HuygensFresnel principle, analytical expressions are derived for the crossspectral density matrix of chirped pulsed Gaussian beams propagating in turbulent atmosphere, which are then numerically simulated. It is shown that there are blue shifts in the spectra of axis point when the spectral width of chirped pulsed Gaussian beams is more than a certain value of 0.336. The turbulence induces the decrease of relative frequency shift of onaxis spectra; the relative frequency shift of onaxis spectra increases nonlinearly with the increasing light source spectral width. Increasing the beam waist radius can inhibit the relative frequency shift and the beam broadening.
曾祥梅, 段作梁, 常凌颖, 张美志. 啁啾脉冲高斯光束在大气湍流中的传输特性[J]. 强激光与粒子束, 2013, 25(9): 2257. Zeng Xiangmei, Duan Zuoliang, Chang Lingying, Zhang Meizhi. Spectral characteristics of chirped pulsed Gaussian beams propagating in turbulent atmosphere[J]. High Power Laser and Particle Beams, 2013, 25(9): 2257.