The quarter-wavelength film used for IR infrared coating is 10-20 times thicker than the visible light area. Therefore, although the level of stress and absorption is negligible in the visible light region, it becomes a limiting factor in the design of IR coating. Most oxides have too high absorptivity in the infrared spectrum range, and MgF2 will produce films that exceed the physical stress level. In addition, the infrared substrate usually has a high refractive index. Therefore, high-performance film-forming materials are needed to produce effective interference structures. “Visible” material cannot be used as the main material for forming optical infrared coating.
The main film-forming materials in the infrared band are fluoride, sulfur compounds and semiconductors. The mechanical and climatic stability parameters of these materials are often much worse than those of oxides and MgF2, and their resistance to ion assistance is poor. In order to improve the performance of the coating, in many cases, it is necessary to introduce additional functional layer and interlayer, and seek a compromise between strength, efficiency and damage.
Optical coating workshop
Our company has advanced equipment and strong technical force in the field of coating, and has advanced experimental instruments and test instruments. The process is mature and stable, and can detect the product quality in time. Our coating products include: white light, near infrared, middle and far infrared, diamond-like carbon film, metal film, etc. Our coating technicians can skillfully and flexibly use Macleod and TFCalc film system design software to design the film system according to the actual requirements of customers to ensure product quality and optical characteristics.
1. Simple infrared coating
2. Broadband infrared coating
3. Ultra-wide band infrared coating
4. Infrared mirror
5. Beam splitter
6. Fourier spectroscope coating
