大口径长焦距反射式偏瞳平行光管光学设计

Optical Design of the Reflective Eccentric-pupil Collimator with Large-aperture and Long Focal Length

对共轴卡塞格伦(Cassegrain)系统和偏瞳Cassegrain系统进行对比分析并指出其缺点.偏瞳Cassegrain系统的视场一般比较小,为增大视场、提高像质,提出将偏瞳两镜系统的次镜偏心和倾斜的方法,并用矢量像差理论简单分析了含有偏心与倾斜元件的系统的初级像差.结合实例分别设计出2种形式的光学系统.对比设计结果可以看出:该方法可以增大系统视场,提高像质,得到比较好的设计结果.

The Eccentric-pupil two-mirror collimator is analyzed and its disadvantages are pointed out. The field view of eccentric-pupil two-mirror system is usually small. In order to enlarge field view and to improve image quality, a method of decentering and tilting the secondary mirror is introduced, the primary aberration of the system with decentered and tilted component is simply analyzed using the vector aberration theory. Two designs are given and compared, showing that the method presented could get a good design by enlarging system field and by improving image quality.