Preparation and Spectrum Characterization of a High Quality Linear Variable Filter
AbstractTo meet the requirements for lightweight, miniaturized dispersive optical systems for space applications, linear variable filters with a high transmittance and spatial dispersion coefficient are proposed. The filters were produced with dual ion beam sputtering, where a single layer thickness variation was achieved with a deposition rate adjustment based on a linear variable correction formula. A linear variable trend matching method was used to correct the film thickness based on the reduction of the mismatch error between two materials: Ta2O5 and SiO2. The influence of the spectral and spatial measuring average effects was addressed by sampling the spot size optimization. This paper presents an all-dielectric linear variable filter that operates between 520 and 1000 nm, with an excellent linear dependence of 40 nm/mm over 12 mm. The linear variable filter possessed a 2.5% bandwidth, and its transmittance was found to be >80% at the central wavelength of the band, with a 0.1% transmittance in the cut-off region. These results indicate great potential for optical devices for space applications, and the developed process has good reproducibility and stability. View Full-Text
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Tang, H.; Gao, J.; Zhang, J.; Wang, X.; Fu, X. Preparation and Spectrum Characterization of a High Quality Linear Variable Filter. Coatings 2018, 8, 308.
Tang H, Gao J, Zhang J, Wang X, Fu X. Preparation and Spectrum Characterization of a High Quality Linear Variable Filter. Coatings. 2018; 8(9):308.Chicago/Turabian Style
Tang, Haolong; Gao, Jinsong; Zhang, Jian; Wang, Xiaoyi; Fu, Xiuhua. 2018. "Preparation and Spectrum Characterization of a High Quality Linear Variable Filter." Coatings 8, no. 9: 308.
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