在提高激光能量利用率和增大成像面积前提下 ,为了尽量减小透镜口径 ,采用会聚光照明前傅立叶变换透镜。由于它在全息制版镜头对称面上形成实的频谱面 ,从而可进行空间滤波处理。结果 ,透镜口径由平行光照明时的 13 5mm减小到 98mm ,成像面直径达到 10 0mm ,曝光时间可缩短为原来的 1/5。由此可得出 ,会聚光照明的傅立叶变换光路 ,在减小透镜口径方面优于 4f系统。 In the premise of increasing the laser energy utilization and increasing the imaging area, in order to minimize the lens diameter, a convergent light illumination front Fourier transform lens is adopted. Because it forms a real spectral plane on the symmetry plane of holographic plate-making lens, it can perform spatial filtering processing. As a result, the lens aperture was reduced from 13 mm at the time of parallel light illumination to 98 mm, the imaging surface diameter reached 10 mm, and the exposure time was shortened to 1/5 of the original. It can be drawn, converging light of the Fourier transform optical path, in reducing the lens aperture than 4f system.