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单片凸透镜由于存在较大像差,在实际应用中难以单独成像,相对孔径越大,单片凸透镜的成像质量越差,通常使用多片透镜以进行像差校正。针对单凸透镜成像质量差的的问题,提出了采用液晶空间光调制器和微扫描光楔实现单片凸透镜的高分辨成像。采用Zygo干涉仪测量单透镜波前,结合Zemax软件模拟得到经单透镜后的畸变波前,利用泽尼克多项式描述畸变波前,并绘制对应共轭波前的灰度图加载于液晶空间光调制器上,校正波像差;通过旋转楔角为21″的光楔进行2×2微扫描,将四幅低分辨率图像经过Keren配准后以结构适应的归一化卷积法合成为一幅高分辨率图像。实验结果表明,图像分辨率MTF50达到1 348 LW/PH,成像质量明显提高。
Monolithic convex lens due to the existence of larger aberrations, difficult to separate imaging in practical applications, the larger the relative aperture is, the worse the imaging quality of the monolithic convex lens, usually using multiple lenses for aberration correction. Aiming at the problem of the poor imaging quality of single convex lens, the high resolution imaging of monolithic convex lens using liquid crystal spatial light modulator and micro-scanning wedge is proposed. Zygo interferometer is used to measure the single lens wavefront and the distortion wavefront after single lens is simulated by Zemax software. The Zernike polynomial is used to describe the distortion wavefront and the corresponding grayscale wave of the conjugate wavefront is loaded into the liquid crystal spatial light modulation , The wave aberration was corrected. The 2 × 2 micro-scan was carried out by rotating the wedge with a 21 "wedge, and the four low-resolution images were Keren-aligned and then converted to a structure-adapted normalized convolution High resolution image.The experimental results show that the image resolution MTF50 reaches 1 348 LW / PH, the imaging quality is obviously improved.