Design and Fabrication of Multi‐Notch Filter with High Transmittance and Optical Density for GREGOR Telescope System

Yanhe Chang; Xiuhua Fu; Gong Zhang; Jing Zhang; Chun Li; Shigeng Song

doi:10.3788/CJL221090

Chinese Journal of Lasers, Volume. 50, Issue 13, 1303102(2023)

Design and Fabrication of Multi‐Notch Filter with High Transmittance and Optical Density for GREGOR Telescope System

Yanhe Chang^1、*, Xiuhua Fu^1,2, Gong Zhang¹, Jing Zhang¹, Chun Li³, and Shigeng Song⁴

Author Affiliations

¹School of Opto-Electronic Engineering, Changchun University of Science and Technology, Changchun 130022, Jilin, China

²Zhongshan Institute, Changchun University of Science and Technology, Zhongshan 528437, Guangdong, China

³State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, Jilin, China

⁴Institute of Thin Films, Sensors and Imaging, School of Engineering and Computing, University of the West of Scotland,Paisley PA1 2BE, UK

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Figures & Tables(10)

Fig. 1. Measured spectral curves of thin films coated on different substrates. (a) Nb₂O₅ thin film; (b) SiO₂ thin films

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Fig. 2. Dispersion curves. (a) Nb₂O₅ thin film; (b) SiO₂ thin film

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Fig. 3. Schematic of optical structure of GREGOR telescopic system

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Fig. 4. Theoretical designs under different merit functions

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Fig. 5. Designed spectral curve of multi-notch filter

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Fig. 6. Schematic of optical monitoring simulation trend

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Fig. 7. Comparison of designed and measured curves multi-notch filter

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Fig. 8. Comparison of uniformity measurement curves of multi-notch filter. (a) Measurement curves; (b) partial magnification of Fig. 8 (a)

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Table 1. Optimal processing parameters
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Table 1. Optimal processing parameters
Parameter Evaporator source 1 Evaporator source 2
Material Nb Si
Argon flow 30.0 cm³/min 30.0 cm³/min
Oxygen flow 35.0-50.0 cm³/min 10.0-15.0 cm³/min
Ion source power 4500 W 4500 W

Table 2. Spectral characteristic parameters
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Table 2. Spectral characteristic parameters
Parameter Value
Permissible error ±2 nm
Angle of incidence 15°
Transmittance ≥90%
Cut-off depth ≥0.1%
Half band width ≤24 nm
Central wavelength 1 490 nm
Central wavelength 2 560 nm
Central wavelength 3 645 nm

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Yanhe Chang, Xiuhua Fu, Gong Zhang, Jing Zhang, Chun Li, Shigeng Song. Design and Fabrication of Multi‐Notch Filter with High Transmittance and Optical Density for GREGOR Telescope System[J]. Chinese Journal of Lasers, 2023, 50(13): 1303102

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