可见光折/衍射混合光学系统消热差设计

Athermal Design for Visible Diffractive-Refractive Hybrid Optical System

由于一些可见光折衍射混合光学系统结构复杂,光学材料种类繁多且光热性能差异大,不能像红外系统那样通过解消色差、消热差方程组得到初始结构。通过分析衍射光学元件的温度特性,采取使用衍射光学元件先消色差再消热差的方法,完成了可见光波段遥感物镜的消热差设计。系统在20℃-10℃范围内成像质量均保持良好,调制传递函数下降范围在6％之内。设计结果表明利用衍射光学元件的混合光学设计使系统结构简单化,并在要求的温度范围内性能稳定。

Because some visible hybrid diftractive-refractive optical systems were complicated, the optical and thermal properties of glass materials in visible band were various. The initial system configurations of the visible hybrid optics could not be reliably gained by achromatic and athermal equations like those of the infrared hybrid optics. The thermal property of diffractive optical elements was analyzed, and achromatic design and athermal design were separately carried through in the optical system design, prompting the completion of designing visible-band, athermal camera lens for space applications. The image quality with the systems was uniform and the shifting range of MTF was confined within 6% , at 20-100 ℃ . Design result showed that hybrid optical system had compact structure and reliable performance within required temperature range.