第18卷第4期 2010年4月
文章编号
1004-924X(2010)04-0792-06
光学精密工程
Optics and Precision Engineering
折/衍混合消热差共形光学系统的设计
孙金霞1,2，刘建卓1,2，孙强"，方伟
Vol.18No.4
Apr.2010
（1.中国科学院长春光学精密机械与物理研究所光电研发中心，吉林长春130033；
2.中国科学院研究生院，北京100049）
摘要：为了满足共形整流罩光学系统无热化工作的要求，基于硅、锗和硒化锌3种材料以及制作于整流罩内壁的衔射面设计了采用折/衍混合消热差方法的红外成像共形光学系统。介绍了共形光学系统像差特性以及衍射光学元件的像差、温度及色散特性，提出了利用可消像散的衍射面结构的温度补偿能力来设计共形光学系统消热差结构的方案，并设计了应用于中波红外成像结构中的万向支架式共形光学系统。软件分析结果表明，该系统充分利用了衍射光学元件的位相补偿，热膨胀系数小和色散因子大等特点，在一40～70℃能够较好地保证士20°搜索观察视场中的成像质量，且所有观察视场中的MTF值均大于0.43。
关键调：共形光学；整流革；消热差；光学设计
中图分类号：V421.35;TH703
文献标识码：A
Athermaldesignforhybridrefractive/diffractive
conformalopticalsystem
SUN Jin-xia'-,LIU Jian-zhuo*-2,SUN Qiang',FANG Wei
(l.PhotoelectricityResearch Center,ChangchunInstitute of Optics,
FineMechanics and Physics,ChineseAcademy of Sciences,Changchun 130033,China
2.GraduateUniversityof ChineseAcademy of Sciences,Beijing100049,China)
Abstract:In order to achievethe athermalization of conformal optical systms,an infrared imaging sys-tem was presented by using the hybrid refractive/diffractive elements made of Si,Ge,and ZnSe and a diffraction surface mounted on the dome's inner surface. The aberration characteristics of conformal optics and the aberration, thermal and dispersion characteristics of diffractive elements were intro-duced, then an athermal method by using the thermal compensation characteristics of the diffractive surface on the dome's inner surface was given. A gimbaled conformal optical system used in mid-IR wavelength was designed. After analyzing the design,it is shown that the conformal optical system makes full use of the charateristics of diffraction elements in good phase compensation,small heat ex-pansion coefficients and big dispersion factors and can work well at -40~7o C while its average
MTF value is higher than O. 43 in each Field of Regard (FOR). Key words: conformal optics;dome;athermalization;lens design
收稿日期：2009-04-14；修订日期：2009-07-06.
基全项目：国家自然科学基金资助项目(No.60977001）