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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。
A set of open-loop dual-band mode based human retinal imaging liquid crystal adaptive optics system is designed. The optical system detects and corrects the wavefront distortion using a Shauk Hartmann wavefront sensor and a liquid crystal spatial light modulator, respectively. The detection band adopts 830nm near-infrared light and the imaging band adopts 790nm near-infrared light. Adopt open-loop mode to improve light energy utilization and system stability, using dual-band mode to increase the field of view. Newly added pupil monitoring subsystem and response matrix measurement subsystem, the system more flexible and convenient. The key parameters of the system are introduced and the optical system is analyzed by ZEMAX software. The result shows that the system can achieve the effect of approaching the diffraction limit. The transfer function MTF @ 50lp / mm reaches 0.25 (corresponding to 3μm on the retina), to meet the design requirements.