Design of large size multiband optical windows

This article designs a large aperture multi-band optical window according to design requirements, using a single planar configuration and multispectral materials to ensure its processing performance. The window dimensions are calculated based on empirical formulas, and the stress and strain results of the window under temperature and pressure loads are analyzed through finite element simulation. The window surface shape changes are obtained through polynomial fitting, and the transmitted wavefront is evaluated using optical simulation software. The transmitted wavefront is not greater than λ/ 15. The final design and simulation results meet the requirements of the indicators.