长焦宽谱校正二级光谱畸变光学系统设计

Design of Optical System of Long Focus & Wide Spectrum Realm To Correct the Secondary Spectrum & Distorion

一星模拟器需要设计一长焦距宽谱段、机场2ω＝8.425°的光学系统．本设计的成功在于两个关键因素．首先，打破双焦、双分透镜选用冕一火石（K－F）或火石一冕（F－K）玻璃组合的惯例，而选用火石－火石（F－F）玻璃组合，为在λ＝0．85μp时二级光谱及畸变达标，前组加一块特种火石玻璃．其次，前后两组各自保留0．7mm反号的位置色差，使各谱线的球差曲线有相对应的排列顺序和大致相同的间距．设计出结构较短的系统；像质上达到了校正二级光谱。

The design of long focus and wide spectrum optical system used in the star simulator is accomplished by.using the flint -flint (F -- F) glass assembly, rather then the crown flint (K - F) assembly or the flint crown (F K) assembly in the double cemented or double separate lens. In order to make secondary spectrum and distortionreach the object on λ = 0. 85μm, a piece of particular flint is added in the front group. In addition, eqUal POsitioncolor aberration of opposing mark: 〔 △Lfs 〕≈0 . 7mm, corrsponding arrangements, and eqUal distances of spheri-cal aberration curve Of each spectrums are kept for front and rear grouups each so that this design is better than otherassembly ones in structure and quality of image and consequently, the goal of eliminating the secondary spectrum.distortion and other aberration is reached.