摘要
进行了近地面水平大气中激光传输湍流效应及其自适应光学相位校正实验，对光束振幅起伏、到达角起伏及其远场Strehl比进行了测量分析。实验结果表明，光束到达角起伏功率谱在低频段（f＜0．4υ／d）近似地满足-2/3次幂关系，而在高频段（f＞0．4υ／d）则近似满足-8／3次幂关系。在较弱湍流效应情况下时数振幅起伏方差小于0．3），相位补偿是有效的，而在较强湍流效应树数振福起伏饱和）时，自适应光学系统常常不能实现稳定闭环。由于传输场景地形复杂，湍流效应及其相位校正效果定量规律的描述还需进一步研究。
The experiment results of adaptive optics phase compensation for laser beam propagation in the horizontal atmosphere is reported. The power spectrum of the laser beamarrival angle is proportional to f^(2/3) when f < O.4 v/d and to f^(-8/3) when (f > 0.4 d/v)respectively. It doesn't agree with the theoretical result of f(-11/3) power law at highfrequency. The adaptive optics system provides good correction under weak turbulenceconditions, but when the variance of the log amplitude gets saturated, the adaptive opticssystem can't be closed steadily.
出处
《量子电子学报》
CAS
CSCD
1998年第2期164-169,共6页
Chinese Journal of Quantum Electronics
基金
国家高技术发展计划激光技术领域资助
