OPTICAL MIRROR Russian patent published in 2022 - IPC G02B5/08 

FIELD: mirrors.

SUBSTANCE: invention can be used as a reflecting optical element of laser equipment operating at the 10.6 mcm wavelength and various optoelectronic instruments to obtain a high reflection coefficient in a wide spectral range. The claimed optical mirror comprises a substrate, a chromium adhesive layer, a reflective layer, and a protective layer. The thickness of the adhesive chromium layer is 50…100 nm; the reflective layer is made of a thin film of an aluminium and copper alloy with a thickness of 200…400 nm at the following ratio of components, wt.%: aluminium 85 to 98, copper 2 to 15, wherein the protective layer is made of lutetium oxide with a thickness of 100…250 nm.

EFFECT: development of a design of an optical mirror leading to an increase in the reflection coefficient in all operating spectral ranges; use of the invention provides a possibility of reaching the reflection coefficient values from 98.1 to 99.3% in the visible spectral range from 0.6 to 0.8 mcm, 99.4 to 99.6% in the middle infrared spectral range from 3.5 to 5.5 mcm, and 99.7 to 99.8% in the far infrared spectral range from 8 to 14 mcm.

1 cl, 4 dwg