摘要
针对声光偏转效应相干探测系统信号光斑随射频信号变化的偏移特性,利用光斑重叠物理模型,研究光斑结构与混频效率的关系,分析光轴偏移、探测器有效光敏面半径以及本振光能量匹配等因素对相干光探测效率的影响。计算机仿真和实验测试验证表明,以能量分布均匀光斑作为本振光斑,有利于在一定范围内漂移的信号光与参考光重叠相干混频效率改善,当信号光偏移量±0.5 mm内,重叠效率下降不到5%,通过光斑结构及能量分布的研究,为后续实际应用提供参考依据。
For signal light spot based on the acousto-optic deflection with RF signal changing in the coherent optical detection system,the relationship between spots structure and mixing efficiency is studied by using spots overlapping physical model,effects of optical axis deviation,active photosensitive surface radius,and local oscillator energy match are analyzed on coherent detection efficiency. The computer simulation and experiment test show that,using uniform energy distribution spots as local oscillator,this is very helpful for coherent mixing efficiency improvement within a certain range drift of signal light spot,when the signal light axis deviation is in the range- 0. 5 ~ 0. 5mm,the overlapping efficiency declines only by less than 5%. Through study of energy distribution and spots structure,the basis reference for subsequent applications can be provided.
出处
《激光与红外》
CAS
CSCD
北大核心
2013年第12期1351-1354,共4页
Laser & Infrared
基金
国家863计划项目(No.2007AA0860)资助
关键词
声光偏转
相干探测
光斑均匀化
光斑重叠
探测效率
光学匹配
acousto-optic deflection
coherent detection
beam uniformity
light spots overlapping
detection efficiency
optical matching
