Thermal optical property representation and optimization method of optical window under low-temperature vacuum environment

Abstract

The invention discloses a thermal optical property representation and optimization method of an optical window under a low-temperature vacuum environment, wherein a fused quartz window in a large-diameter parallel optical tube system under the low-temperature vacuum environment is simulated through a finite element method. The method is based on a customized surface type of an optical design software, wherein the surface type is combined with an even order aspheric surface type and the surface type of a gradient refractive index surface and used for representing optical window surface shape variation and material refractive index variation caused by temperature difference and pressure difference. A biasing afocal lens group is used for optimizing off-axis field of view wave aberration of the large-diameter parallel optical tube system, after surface shape variation caused by temperature variation is added, a zoom design is used for compensating system wave aberration and focal length variation caused by temperature, the wave aberration is optimized to be less than diffraction limit, thus, requirements of use are satisfied. The method has the advantages of comprehensively representing the optical window thermal optical property, using a small-diameter element for optimizing aberration of the large-diameter element, being adaptive to various temperature variations, being simple in structure, and so on.

Description

technical field

[0001] The invention belongs to the field of optical thermal analysis, and in particular relates to a method for characterization and optimization of thermo-optical characteristics of an optical window in a low-temperature vacuum environment. Background technique

[0002] As a common optical element, the optical window is widely used as an optical channel of the optical system in space payloads and equipment such as submarines, tanks, and missiles. It plays the role of light transmission, pressure isolation, and temperature isolation. Its optical performance directly affects The performance of the optical system.

[0003] When the optical window is in use, the two sides are usually in different environments. The resulting temperature and pressure differences will change the surface shape of the optical window and the refractive index of the material, thereby changing the transmitted wavefront of the optical window and affecting the imaging quality of the subs...

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