物光参考光同光轴的体全息存储光学系统设计

将两块漫射板分别置于输入面的两侧,使物光和参考光同光轴,可以使体全息存储傅里叶变换光学系统更为紧凑。然而,在这种全息存储光学系统中,物光和参考光的总数值孔径较物光数值孔径大很多。分析这种体全息存储光学系统物光和参考光光路的设计要求和光学参量的确定;采用多重结构方法对物光正向光路、逆向光路和参考光光路同时优化设计,实现对物光光路二对物像共扼位置控制像差,并满足参考光光路的要求;给出前后组焦距分别为33 mm和30 mm的物光和参考光同光轴,前工作距为30 mm,物光和参考光总数值孔径为0.53的全息存储光学系统的设计结果。系统的波像差小于0.071λ,达到衍射极限。

Design of Volume Holographic Storage Optical System with Common Optical Axis for Signal Beam and Reference Beam

The volume holographic storage optical system can be simplified, using the common optical axis for signal beam and reference beam by locating two diffusers on both sides of the incident plane. However, in this kind of holographic storage optical system, the total numerical aperture for signal beam and reference beam is much larger than the numerical aperture for signal beam. The design requirement and optical parameter determination about signal optical path and reference optical path in this volume holographic storage optical system have be analyzed. In order to correct aberration in positive optical path and reverse optical path for the object beam, and meet the demand of reference beam at the same time, the multi-configuration method has been adopted to optimize the positine and reverse optical path of the object beam and the optical path of the reference beam. A holographic storage optical system with common optical axis for signal beam and reference beam achieving diffractive-limit has been designed. The focal lengths of the front and rear group lens are 33 mm and 30 mm, respectively, its front work distance is 30 mm, its back group lens has 30 mm focal length, its total numerical aperture for signal beam and reference beam is 0.53, and the wave aberration of the system is less than 0.071λ.