The fabrication of "bulk" diamond materials with high transmittance and enough thickness was essential for application as infrared windows. The present work reported the preparation, microstructure and optical properties of polycrystalline diamond materials by MPCVD method using ultralow nitrogen doping (0–80 ppm). The effects of nitrogen concentration and synthesis temperature on the crystalline quality, microstructure, and infrared transmittance were systematically studied by XRD/Raman, SEM/TEM, and UV–VIS/FTIR spectrophotometer, respectively. The results showed that nitrogen doping with appropriate concentration could promote the formation of texture with strong <110> plane orientation, and the growth rate was significantly enhanced without obvious reduction in the optical quality. The freestanding diamond materials fabricated at the nitrogen concentration (10–20 ppm) had high <110> texture degree, enough thickness (>0.7 mm), fast growth rates (~3–6 μm/h), and peak transmittance of ~70.1 % in the infrared band (3.0–15.0 μm). The nitrogen doped diamonds fabricated by this process had excellent performance which showing potential applications as infrared windows for ultrahigh-speed aircrafts. 

Fabrication, microstructure and optical properties of 〈110〉 textured CVD polycrystalline diamond infrared materials

Stress Field Evolution of Antifriction Wear-Resistant Sealing Coatings on GH4169 Superalloy Substrate under Thermal Shock

Infrared window properties of AB₂C₄ (A=Zn; B In, Ga; C Te, Se) materials via machine learning and density functional theory

Investigation into deep-cutoff notch filters for fluorescence endoscope imaging

Numerical study of thermal shock on infrared windows and their composites with diamond coatings under harsh conditions

The stress’s accumulation will critically affect optical device stability, leading to components’ deviation and film peeling. Stress control techniques based on strain cancelation cannot precisely match film stress, and it is difficult to reduce the total stress of multilayer film to ultra-low levels. Existing software for film system design is mainly based on 2D design concepts such as wavelength-spectrum and does not consider 3D design concepts such as wavelength-spectrum-stress, but the stress parameter plays an essential role in film performance, and it is necessary to use it as an optimization index for film design. In this paper, we introduce mechanical synchronization design into film system design. The multilayer film’s optimal structure is precisely matched by the genetic algorithm, and an ultra-low stress and wide-spectrum optical film element is developed under the dual requirements of optical performance and mechanical performance. This technique incorporates computer-aided design and automatically seeks an optimal combination of layered film nanostructures through self-compiled optical and mechanical compatible design software. While ensuring invariant optical properties, it can effectively reduce the total stress of multilayer film. This can provide a new idea for film stress control.

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Research on Optical and Mechanical Compatible Design Technology of Multilayer Films

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Numerical study of thermal shock on infrared windows and their composites with diamond coatings under harsh conditions

Research on Optical and Mechanical Compatible Design Technology of Multilayer Films