Diamond infrared window film and preparation method thereof

By depositing a rare earth metal oxide film on the surface of a diamond substrate, destructive interference is used to reduce reflectivity and form a chemical barrier, thus solving the problems of easy oxidation and high reflectivity of diamond at high temperatures and achieving compatibility between high transmittance and high thermal shock resistance.

CN121320875APending Publication Date: 2026-01-13TIANJIN JINHANG INST OF TECH PHYSICS
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Patent Information

Application Number
CN202511486326.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-10-17
Publication Date
2026-01-13

AI Technical Summary

Technical Problem

Diamond is easily oxidized in high-temperature and high-oxygen environments and has high reflectivity, resulting in low transmittance. Existing technologies cannot achieve both high transmittance and high resistance to thermal shock and oxidation.

Method used

A rare earth metal oxide film is deposited on the surface of a diamond substrate. Taking advantage of the fact that the refractive index of rare earth oxides is between that of diamond and air, the reflectivity is reduced through destructive interference, and a dense chemical barrier is formed to prevent oxidation. The rare earth oxides are deposited using an ion-assisted thermal evaporation method.

Benefits of technology

It significantly improves the transmittance of the diamond window and effectively blocks oxidation at high temperatures, ensuring the stability of the structure and optical performance.

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Abstract

According to the diamond infrared window thin film and the preparation method thereof, the rare earth metal oxide thin film is arranged on the surface of the diamond substrate, firstly, the average transmittance of a target wave band is remarkably improved by selecting the rare earth oxide with the refractive index between that of diamond and that of air and utilizing the destructive interference principle; and the problem of high reflection loss is efficiently solved. And secondly, the compact oxide film forms a physical and chemical barrier on the surface of the diamond, and direct contact between high-temperature oxygen and a substrate is effectively blocked, so that the oxidation reaction at 700-800 DEG C is inhibited, and the high-temperature oxidation problem of the diamond is fundamentally solved. Finally, the thin film has high anti-reflection performance, strong oxidation resistance and excellent film-substrate binding force, so that the diamond window thin film can still keep stable optical performance and complete structure after bearing severe thermal shock.
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