In optical systems, the performance of ultra-low reflection and anti-reflection coatings has a significant impact on the quality of equipment. The ultra-low reflection and anti-reflection coating developed by Nanjing Apex Optics Co., Ltd. has good performance in terms of surface shape stability and damage threshold, and is suitable for various high-end optical scenarios.
In terms of surface shape stability, taking a large-size aspheric mirror (D580*100) as an example, the surface shape accuracy before coating is PV 0.468λ and RMS 0.027λ, and after coating, it is PV 0.481λ and RMS 0.028λ. The variation is lower than the industry 0.05λ threshold. This is due to the "low-temperature deposition + stress compensation" technology, which controls the coating temperature below 80℃ and reduces surface shape distortion through stress offset design of multi-layer materials. A space research institute feedback that its products have stable surface shape in the space environment and meet the accuracy requirements of satellite remote sensing.
In terms of damage threshold, the test by Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences shows that under the laser irradiation of 1064nm wavelength, 10ns pulse width and 20Hz repetition frequency, the damage threshold of the film layer reaches 31J/cm² after 100-point test, which is higher than the industry average of 20-25J/cm². It can withstand long-term irradiation of certain intensity lasers and is suitable for laser cutting and other scenarios. This is due to the adoption of ion-assisted deposition technology to control the impurity concentration in the vacuum chamber and improve the film quality.
The film has a wide range of application prospects. It can improve energy utilization in laser equipment, reduce stray light in medical endoscopes, and enhance light transmittance in aerospace infrared detection systems. At present, it has been applied to domestic laser equipment manufacturers and university experimental teams. The company plans to further improve its performance and expand the application band.