Abstract
Temperature variation not only results in changes in refractive index, radius, thickness, and air space, but also leads to surface deformation due to the mismatch in thermal expansion coefficients between glass and mechanical materials. However, existing passive athermal optical design methods cannot optimize thermal-induced surface deformation, and optimization methods usually focus on structural optimization or thermal control rather than optical optimization. Here, we investigate the deterioration in image quality caused by thermal-induced surface deformation and propose a passive athermal optical design method to reduce deterioration. To this end, MATLAB was utilized to jointly call finite element analysis (FEA) software (COMSOL) and optical design software (Code V) to realize the data exchange of an optical–mechanical–thermal integrated analysis for iterative optical optimization. This process makes automatic iterative optimization possible by transforming parametric FEA results into Zernike coefficients in each iteration of optimization. The theoretical and design examples indicate that our method can effectively reduce the degradation in image quality with surface deformation. Our method provides an optical optimization approach for optical designers to work on a passive athermal optical design by considering thermal-induced surface deformation.
Highlights
Compared to optical–mechanical–thermal integrated passive athermal design methods, we provide a passive athermal optical optimization method through which optical designers can reduce the deterioration of image quality caused by thermal-induced surface deformation
We propose a passive athermal optical design method that considers thermal-induced surface deformation
This method takes into account the effect of thermal-induced surface deformation and completes the optimization compared to conventional passive athermal optical design methods [8,9,10,11]
Summary
Active athermalization increases the complexity, volume, and weight of the optical system [1,2]. To avoid these disadvantages, passive athermalization ensures that an optical system without an additional focusing mechanism still provides clear image quality over an entire operating temperature range. Passive athermalization ensures that an optical system without an additional focusing mechanism still provides clear image quality over an entire operating temperature range This design method is used in optical systems with wide operating temperature ranges, such as large relative aperture photographic objective lenses, aerial drone lenses, projection optical systems, etc., [3,4,5]. Conventional passive athermal design is completed by glass material selection and optical–mechanical–
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