开环双波段人眼视网膜成像液晶自适应光学系统设计  

Design of LC Adaptive Optics System for Human Retinal Imaging Operated on Open-Loop and Two-Wavelength Mode

作　　者：程少园[1,2] 曹召良[1] 胡立发[1] 穆全全[1] 李鹏飞[1,2] 刘超[1,2] 宣丽[1] 

机构地区：[1]中国科学院长春光学精密机械与物理研究所,应用光学国家重点实验室,吉林长春130033 [2]中国科学院研究生院,北京100039

出　　处：《激光与光电子学进展》2010年第2期86-92,共7页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(50703039);国家重点基金(60736042,60578035)资助课题

摘　　要：设计了一套基于开环双波段模式的人眼视网膜成像液晶自适应光学系统。该光学系统分别采用夏克-哈特曼波前传感器和液晶空间光调制器来探测和校正波前畸变。探测波段采用830nm近红外光,成像波段采用790nm近红外光。采用开环模式以提高光能利用率和系统的稳定性,采用双波段模式以增大视场。新加入了瞳孔监控子系统和响应矩阵测量子系统,使系统更加灵活方便。介绍了系统的关键参数,并通过ZEMAX软件对光学系统进行模拟分析,认为系统可以达到接近衍射极限的效果。传递函数MTF@50lp/mm达到0.25(对应视网膜上3μm),满足设计要求。An adaptive optics （AO） retinal imaging system based on liquid crystal spatial light modulator was presented, which was operated on open-loop and two-wavelength mode. The system adopted a Shark-Hartmann wavefront sensor （SHWS） and a liquid crystal spatial light modulator to detect and correct wavefront aberrations respectively. 830 nm near infrared light was used for the wavefront detection, and 790 nm near infrared light was used for retinal imaging. The open-loop mode can enhance the light efficiency and improve the system stabilization; the two-wavelength mode can enlarge the view field. The subsystems of pupil monitoring and respond matrix measuring were introduced to make the system more convenient. Some key parameters were introduced, and the optical system was simulated and analyzed with ZEMAX. It shows that the optical system can reach the diffraction limitation, and MTF@50 lp/mm of 0.25 （3 μm at retina）, which satisfies the design requirements.

关 键 词：自适应光学 视网膜成像 液晶空间调制器 近红外 

分 类 号：TH74[机械工程—光学工程]