振幅型复合计算全息模式波前传感理论及验证  

Theory and demonstration of amplitude-type multiplexed computer-generated hologram for modal wavefront sensing

作　　者：刘长海[1,2] 徐蓉[2] 门涛[2] 温昌礼[2] 郭世平[3] 

机构地区：[1]宇航动力学国家重点实验室,西安710043 [2]中国西安卫星测控中心,西安710043 [3]西安交通大学系统工程研究所,西安710049

出　　处：《强激光与粒子束》2013年第9期2198-2202,共5页High Power Laser and Particle Beams

摘　　要：全息模式波前传感器是利用复合全息元件对待测波前中像差模式进行直接测量的一种新型波前传感器,其中的复合全息元件可编码设计多阶Zernike像差模式。提出一种有效方案以编码设计振幅型复合计算全息元件,该方案通过将多个编码有某阶Zernike像差模式的透过率调制扭曲光栅叠加产生振幅型计算全息元件。在小像差近似条件下推导了传感器输出信号与Zernike像差模式系数的解析关系。编码设计了振幅型复合全息图,并研究了其对单阶和多阶Zernike像差模式的探测性能。利用液晶光阀加载复合全息图进行了验证实验。所得实验结果与数值模拟结果基本一致。The holographic modal wavefront sensor is a novel sensor,which directly detects the aberration modes included in the distorted wavefront by employing a multiplexed computer-generated holographic element（MCGHE）.This element can be designed and generated by pre-coding multiple Zernike aberration modes.We propose an efficient approach of designing the MCGHE,which is generated through superposing several amplitude gratings distorted by specific aberration modes.The analytical formulas are derived to characterize the relationship between the sensor output signal and the coefficient of particular Zernike aberration mode,given the condition of small aberration approximation.The MCGHE is designed and simulated in detecting single Zernike aberration mode or multiple ones.The demonstration experiment is carried out by utilizing a liquid crystal light valve.The experimental results are consistent with the numerical ones to some extent.

关 键 词：自适应光学 模式波前传感器 振幅型复合计算全息元件 Zernike像差模式 

分 类 号：O436[机械工程—光学工程]