以自适应光学技术为基础塔建了高分辨视网膜成像系统。利用微变形反射镜(DMs)作为波前校正器件,将镜面的形貌、波前及镜面的响应函数表示为泽尼克Zernike多项式的线性组合,利用直接迭代算法及控制电压矩阵改变镜面形貌,从而实现对眼睛波前畸变的适时校正。校正后残余误差的平方根值小于λ/7,接近衍射的极限分辨率。实验表明此闭环系统带宽小于5Hz,能校正多数情况下眼睛的动态波前畸变,能对眼科医学的诊断提供一定的帮助。
A high-resolution retina imaging system based on adaptive optics technology is built. We use a deformable mirror as a wave-front corrector. The surface of the mirror,wave-front and the influence functions are expressed in terms of an expansion of Zemike's polynomials. We use a straightforward iterative algorithm and control matrix to control the surface of deformable membrane in order to compensate the eye's aberration in real-time. After correction,we can get a root mean square (RMS) correction precision of lower than 2/7 which is nearly the diffraction limited resolution. The experiment shows that the closed loop bandwidth is lower than nearly 5 Hz,which is capable to track most of the dynamics aberration in human eye and aid eye medical diagnosis so the system has a good future in eyesight's correcrion.