Stressed state of laminated interference-absorption filter under local loading

The article describes a design of an interference-absorption short-wave cut-off filter which provides the minimum light transmission in the visible region of the spectrum from 0.65 to 0.78 mu m and the maximum light transmission in the range 2.0 mu m to 5.0 mu m. An engineering technique for calculation of stressed state and strength of a layered light filter element under local loading has been developed. Acceptable loadings for a layered Si-SiO composition on sapphire substrate has been estimated.