摘要
在强背景下的窄线宽激光回光探测研究中,采用光谱滤波的方式可以滤除背景光,提高探测系统的信噪比;对于光栅滤波系统而言,考虑到信号光经过大气信道传输后会引起波前相位畸变,而这会对系统的滤波性能产生一定影响,故而有必要对其进行深入研究。针对光栅光谱滤波在激光大气传输探测方向的应用,从激光大气传输理论和光栅衍射原理出发,建立了光栅在入射光场为大气扰动光场时的光谱光强分布仿真模型,分析了大气相干长度以及系统结构参数对系统性能的影响,给出了光栅光谱滤波技术系统及大气适用条件,当大气相干长度r_0>0.05 m时,得到了亚纳米级的光谱滤波线宽(半峰全宽FWHM为0.3 nm),有效光谱的透射率也超过了0.90,并通过大量仿真实验进行了验证。
In the study of narrow linewidth laser light echol detection under strong background, we utilize spectral filtering method to filter out background light and improve the signal-to-noise ratio. For the grating filter system, the transmission of signal light through the atmospheric channel will cause the wavefront phase distortion, and this will have a certain effect on the filtering performance of the system, so it is necessary to study it further. Aiming at the application of grating spectral filtering in the laser atmospheric transmission detection direction, based on the laser atmospheric transmission theory and the grating diffraction principle, we establish the simulation model of the spectral intensity distribution of the grating when the incident light field is atmospheric disturbance light field. The influences of atmospheric coherent length and system structural parameters on system performance are analyzed. The system of the grating spectral filtering technology and the atmospheric applicable conditions are given. When the atmospheric coherent length r0 is greater than 0.05 m, suh-nanometer level spectral filter linewidth （full width at half maximum is 0.3 nm） is obtained, and the transmission of the effective spectrum exceeds 0.90. The results are verified by a large number of simulation experiments.
作者
许放
万敏
颜宏
张永红
谢庚承
Xu Fang;Wan Min;Yan Hong;Zhang Yonghong;Xie Gengcheng(Institute of Applied Electronics, China Academy of Engineering Physics, Mianyang, Sichuan 61900, China ; Graduate School of China Academy of Engineering Physics, Beijing 100088, China)
出处
《中国激光》
EI
CAS
CSCD
北大核心
2018年第10期188-196,共9页
Chinese Journal of Lasers
基金
中国工程物理研究院高能激光科学与技术重点实验室基金(CAEP2017090623210)
关键词
光栅
光谱滤波
窄线宽
高效率
双光栅
大气湍流
gratings
spectral filtering
narrow linewidth
high efficiency
double grating
atmospheric turbulence
