摘要
利用数值模拟的方法,对三种不同发射口径情况下准直强激光水平传输稳态热晕效应的自适应光学相位补偿进行了计算。结果表明,定标参量N_D/N_(FB)可充分描述其相位补偿的效果,且对理想柔形镜及实际自适应光学系统相位补偿而言,其不稳定性定标参量的阈值分别为6.0、0.35。当N_D/N_(FB)小于阈值时,相位补偿效果理想且随N_D/N_(FB)的改变Strehl比变化平缓;而当N_D/N_(FB)大于阈值时,由于相位补偿不稳定性的增强,补偿效果迅速变差。
By using the four-dimensional propagation code, the adaptive optics (AO) phase compensation for thermal blooming of the collimated beam is calculated. The results show that the ratio of the thermal distortion number to Fresnel number of whole-beam (ND/NFB) can adequately evaluate the efficiency of the AO phase compensation. Moreover, the threshold values of phase compensation instability are obtained. Corresponding to the ideal compensation and the AO compensation, the threshold values are about 6. 0 and 0. 35. When the value of ND/NFB is less than the threshold values, the efficiency of phase compensation is good and variation of the Strehl ratio with ND/NFB is slow, but when the value of ND/NFB is greater than the threshold values, the phase compensation efficiency decreases rapidly.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2002年第12期1461-1464,共4页
Acta Optica Sinica
基金
国家高技术发展计划激光技术领域资助课题
