球差光束在大气湍流中传输特性的实验研究*

摘要

The propagation properties of spherically aberrated beams through atmospheric turbulence are studied experimen-tally, where the spherically aberrated beams are generated by a spatial light modulator (SLM), and the atmospheric turbulence is simulated by the rotary random phase plate. It is shown that both for the positive and negative-spherical aberrated beams, the intensity distribution is multi-annular in free space, but it becomes a Gaussian-like profile in tur-bulence. The positive spherical aberration results in a beam spreading, while the negative spherical aberration causes a beam focusing. The larger the positive spherical aberration, the worse the power in the bucket. However, the dependence of the negative spherical aberration on the power in the bucket is non-monotonic. In particular, the effect of spherical aberration on beam spreading decreases due to turbulence.%采用空间光调制器产生球差光束，并利用旋转随机相位板模拟大气湍流，实验上研究了球差光束在大气湍流中的传输特性。研究表明：在自由空间传输时，正、负球差光束光强分布均为环形多层分布，但经过大气湍流传输后光强均会变为类高斯分布。正球差导致光束扩展，负球差会导致光束聚焦。正球差越大光束能量集中度越差。负球差对光束能量集中度的影响是非单调的。特别地，大气湍流会削弱球差效应对光束扩展的影响。