钠激光导星的饱和效应分析  

Analysis of saturation of sodium laser guide star

作　　者：王锋[1] 叶一东[1] 胡晓阳[1] 雒仲祥[1] 颜宏[1] 何丽[1] 

机构地区：[1]中国工程物理研究院应用电子学研究所,四川绵阳621900

出　　处：《红外与激光工程》2012年第6期1471-1476,共6页Infrared and Laser Engineering

基　　金：中国工程物理研究院应用电子学研究所所长基金(SJ20071103)

摘　　要：针对自适应光学系统波面探测的应用需求,从平衡态和非平衡态的角度讨论了钠激光导星的回光强度。利用热平衡态下的状态方程,分析了平衡态时因入射信标激光增强所导致的钠激光导星饱和效应问题。结果表明,原子分数随辐射功率谱密度的增强而增大,其变化速率的下降是钠激光导星回光效率降低的根本原因。分析了信标激光器线宽、探测装置子孔径大小、积分时间对共振荧光回光探测的影响,模拟计算并得到了特定条件下能够满足自适应光学系统波面探测的信标激光器功率指标要求。According to the wavefront detecting requirement of adaptive optical system, the intensity of sodium laser guide star was discussed in equilibrium and non-equilibrium state respectively. By thermodynamic equilibrium state equation, the saturation of sodium laser guide star in equilibrium state due to the increasing incident beacon laser intensity was analyzed. The results show that the atoms fraction increases with the intensification of radiation power density, whose varying rate decrease is the reason of saturation. The influences of beacon laser bandwidth, subaperture diameter and detecting integration time on the backscattering intensity of resonance fluorescence were analyzed. Under given coditions, the laser power for the wavefront detecting requirement of adaptive optical system was simulated and calculated.

关 键 词：钠激光导星 饱和 功率 线宽 

分 类 号：O436.2[机械工程—光学工程]