Ultra-smooth dual-band reflector and preparation method thereof

Abstract

The invention provides an ultra-smooth dual-band reflector and a preparation method thereof. The ultra-smooth dual-band reflector comprises a substrate and a reflecting film plated on the substrate, the reflecting film is composed of platinum films and non-metal films which are alternately stacked through metal, the metal films comprise chromium films and platinum films, the chromium films are plated on the substrate, the platinum films and the non-metal films are alternately laminated and plated on the chromium films, the top layer and the bottom layer in the laminated structure formed by the platinum films and the non-metal films are chromium films, the thickness of each chromium film is 1 to 3nm, the thickness of each platinum film is 5 to 30nm, the thickness of each non-metal film is 1 to 100nm, and the total thickness of the reflecting film is 100 to 300nm. According to the invention, the low high-frequency roughness and the low intermediate-frequency roughness can be ensured, the reflectivity to an imaging waveband is high, the space environment irradiation resistance is high, the space adaptability is good, and the performance is stable.

Description

technical field [0001] The invention relates to the technical field of reflecting mirrors, in particular to an ultra-smooth dual-band reflecting mirror and a preparation method thereof. Background technique [0002] In coronal imaging detection, since the light intensity on the solar surface is much higher than the coronal light intensity, stray light suppression is the focus and difficulty in the development of coronagraphs. At present, there are mainly two kinds of coronal imaging optical systems: internal cover type and external cover type. The main mirror in the built-in imaging optical system directly faces the sunlight, and its scattering is the main source of stray light. Therefore, in addition to requiring the main reflector to have high reflectivity in the imaging band (121.6nm and visible light band), the main reflector is also required to have an ultra-smooth surface (roughness better than 0.3nm). To get an ultra-smooth mirror, you first need an ultra-smooth sub...

AI Technical Summary

Problems solved by technology

[0004] The SCORE coronal observation payload developed in Italy uses a Mo / Si multi-layer mirror with a high-frequency roughness of about 0.5nm, which will cause severe large-angle scattering; the reflectivity in the visible light band is low, and the absorption rate is 57%. Left and right, in the case of direct sunlight, the lens temperature will exceed 50°C, which will cause the lens surface to deteriorate; no matter whether the last layer of the Mo / Si multilayer mirror is Mo or Si, in the harsh space environment (atomic Oxygen, high-energy protons, electrons, high-energy rays, ultraviolet light), the oxidation of the film layer will occur, resulting in a decrease in the reflectivity at 121.6nm

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