Preparation and Spectrum Characterization of a High Quality Linear Variable Filter

• Main Authors: Haolong Tang, Jinsong Gao, Jian Zhang, Xiaoyi Wang, Xiuhua Fu
• Format: Article
• Language: English
• Published: MDPI AG 2018-08-01
• Series: Coatings
• Subjects: linear variable filter; coatings; dual ion beam sputtering; film thickness correction; spectrum analysis
• Online Access: http://www.mdpi.com/2079-6412/8/9/308

To 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.