Development of high-performance 50nm bandwidth rectangular wave filter

Dong Ying; Tao Zhong; Hu Rong; Zhang Xiang; Yong-qiang Liu

doi:10.1117/12.2627129

28 March 2022 Development of high-performance 50nm bandwidth rectangular wave filter

Dong Ying, Tao Zhong, Hu Rong, Zhang Xiang, Yong-qiang Liu

Proceedings Volume 12169, Eighth Symposium on Novel Photoelectronic Detection Technology and Applications; 12169C2 (2022) https://doi.org/10.1117/12.2627129
Event: Eighth Symposium on Novel Photoelectronic Detection Technology and Applications, 2021, Kunming, China

Abstract

A method for designing and depositing rectangular wave broadband-pass filter is put forward after a deep study of the nature of the film-filters. A rectangular wave OD3-A broadband-pass filter sample is designed and prepared with this method, with its reference wavelength λ₀=515nm in the working range of 400~1100nm. The average transmittance of the sample in its pass-band of λ₀ ±25nm reaches 92.7%, meanwhile the transmittance in the high-reflective bands of λ ≠ λ₀ ±25 nm is less than 0.1%. The transmittance of the thin film sample is tested, and the spectrum meet the requirement. It turned out to be a more advanced technology of designing and depositing rectangular wave broadband-pass filter. Compared with the Fabry-Perot Interferometer narrow-band pass filters’ films which needs optical-controlling method, and the traditional film which combines short and long pass filters making the coatings very thick and with low transmittance in transition zone. it is more economical, have more wide range of transmission and the transmittance is higher in the range of pass-band.

Citation Download Citation

Dong Ying, Tao Zhong, Hu Rong, Zhang Xiang, and Yong-qiang Liu "Development of high-performance 50nm bandwidth rectangular wave filter", Proc. SPIE 12169, Eighth Symposium on Novel Photoelectronic Detection Technology and Applications, 12169C2 (28 March 2022); https://doi.org/10.1117/12.2627129

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KEYWORDS

Bandpass filters

Transmittance

Optical filters

Thin films

Reflectivity

Crystals

Refractive index

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