Design and preparation of LWIR narrow-band filter with wide rejection band

• 来源期刊: 中国光学快报（英文版）
• 年，卷（期）: 2013,（z1）
• 页码范围: 100-102
• 页数: 3页
• 语种: 英文
• DOI: 10.3788/COL201311.S10401

摘要

In this letter,using mult-half-wave structure and some chosen films optimized method,the long-wave infrared (LWIR) narrow-band pass filter is investigated,meanwhile the opposite of the substrate coated with long-wavelength pass film.The transmittance of design spectrum is more than 80％ at wavelength region of 8.05-8.35 μm,and the average transmittance is less than 0.5％ at wavelength region of less than 7.95 and 8.45-14 μm.The filter is prepared by thermal evaporation method,and plasma-assisted deposition technology.The experiment result shows that the average transmittance is about 75％ in the transmission wavelength range,and the average transmittance of cut-off band is about 0.3％.The results show that multi-half-wave structure and some chosen films optimized method for the preparation LWIR narrow-band pass filter are feasible.The film system is simplified and is convenient to prepare the film.