Design and research of steep side of the multi-layer dielectric thin films [多层介质薄膜的陡边设计与研究]

作者：Zhang Y.; Zheng J.; Qi H.; Ruan S.^*; Wang Y.; Zhao J.

来源：Journal of Shenzhen University Science and Engineering, 2018, 35(5): 505-510.

DOI：10.3724/SP.J.1249.2018.05505

• High-power laser materials
• Multi-layer
• Optical engineering
• Resolution
• Spatial filter
• Steep side
• Thin films

In order to achieve high performance of spatial filtering, the components must have a high reflectivity and transmittance. This is because the spatial filtering is achieved by changing fast between high reflectivity and high transmittance of the edge of the reflective component. The reflective band edge of the multilayer dielectric film has high reflectivity and high transmittance characteristics and angular sensitivity, so the multilayer dielectric film reflective component becomes one of the most promising components in the combined filter device. This paper designs the steep edges of multilayer dielectric film reflective film components. We propose an idea of achieving filtering by using multi-layer dielectric film reflection element, and give the target of angular and wavelength resolution in order to make the film design more effective. For the multi-layer dielectric films, we compare and investigate the designs of steep sides for the advanced new type reflective thin films, F-P band pass filter and long pass reflective films. By considering the anti-damage ability of the components and calculating the normalized electric field strength, we find that the designs for the high level new type reflective film and the long pass new type reflective film are optimal. These research results will lay a good foundation for the design and preparation of the next-stage dielectric film filter, which has important guiding significance.