双谱段共孔径光学镜头设计与验证

Design and Verification of Dual-Spectrum Common- Aperture Optical Lens

为实现自主制导、目标定位、跟踪搜索等复合制导功能,提出了一种可实现红外与激光双谱段共孔径一体化的小型光学镜头设计方案,采用透射式光学系统,光路中设置了一个楔角分光片,既实现了双谱段分光,又有效矫正了45°倾斜放置的平板带来的系统像差。设计结果如下:红外通道全视场平均调制传递函数(MTF)优于0.45(30 lp/mm)、激光通道±1.5°线性区弥散斑直径4.88~5.03 mm,能量分布均匀,满足指标要求。最终采用高精度光学定心调整与三坐标精确测量相结合的方法完成了该镜头的装调,红外通道全视场平均MTF优于0.38,激光通道弥散斑形状对称、线性区内能量分布均匀,满足使用要求,镜头效果良好。

In order to achieve compund guidance functions,such as autonomous guidance,target positioning,tracking and searching,etc.,a design scheme of a small optical lens is proposed,which can realize the integration of infrared and laser dual-spectrum and common aperture.The transmission optical system is adopted,and a wedge angle splitter is arranged in the optical path,which not only realizes dual-spectrum beam splitting,but also effectively corrects the system aberration caused by the 45° inclined flat plate.As a result,the average Modulation Transfer Function(MTF) of the infrared channel is better than 0.45(30 lp/mm),and the diameter of diffusion spot in ±1.5° linear area of laser channel is 4.88~5.03 mm,and the energy distribution is uniform,which meets the requirements of the index.Finally,the high-precision optical centering adjustment and three-coordinate precise measurement are used to complete the assembly and adjustment of the lens.The average MTF of the full field of view of the infrared channel is better than 0.38,the shape of the dispersion spot in the laser channel is symmetrical,the energy is evenly distributed in the linear region,and the lens effect is good.