Photoinduced thermal deformation image quality analyzing method of transmission-type optical element

Abstract

The invention belongs to the thermal-optical field of optical instruments and relates to a photoinduced thermal deformation image quality analyzing method of a transmission-type optical element. According to the method, factors such as atmosphere, power, wavelength, refractive index and temperature coefficient, are considered; a thermal analysis model is established through finite element software I-DEAS (Integrated Design Engineering Analysis Software), radiation heat exchange and conduction heat exchange of all surfaces are considered to solve the temperature field distribution of the optical element and the coordinate position and deformation amount of each node; optical surface face-type fitting is realized through a Zernike polynomial and a novel cylindrical coordinate fitting method is provided to realize accurate fitting of a temperature field from characteristics of a heat source of an optical system, thereby calculating a geometrical journey through which lights pass at different clear aperture positions and a reactive index function of material, so as to obtain the wave-front distortion and PV (Page View) and RMS (Root-Mean-Square) values. The method disclosed by the invention has the advantages of simplicity in realization, high accuracy and good program generality, and is suitable for calculating the wave aberration of any transmission-type optical element.

Description

technical field [0001] The invention belongs to the field of thermal optics of optical instruments, and relates to a method for analyzing image quality of light-induced thermal deformation of a transmission optical element. Background technique [0002] In recent years, with the development of science and technology, some scholars have paid more and more attention to the influence of temperature on optical systems, not only considering the surface distortion caused by temperature changes, but also taking into account the refractive index gradient caused by temperature. Commonly used optical design software (Code-V, Zemax, etc.) generally believes that the temperature of optical components is uniformly distributed, and the temperature gradient distribution cannot be set arbitrarily. The commercial software SigFit of Sigmadyne Company of the United States and the PC Fringe of RMR Design Group Company use the same data transmission technology, that is, use the interference insp...

AI Technical Summary

Problems solved by technology

This method is to calculate the optical path change in the process of random ray tracing, so it has limitations

However, for an optical system containing an absorption optical intensity modulation optical element, the temperature gradient inside the element changes greatly, which will produce an obvious refractive index gradient, thereby affecting the beam quality of the system

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