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Kwon OT, Kim G, Bae H, Ryu J, Woo S, Cho BK. Development of a Mercury Bromide Birefringence Measurement System Based on Brewster's Angle. SENSORS (BASEL, SWITZERLAND) 2023; 23:s23094208. [PMID: 37177412 PMCID: PMC10180884 DOI: 10.3390/s23094208] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/07/2023] [Revised: 04/10/2023] [Accepted: 04/21/2023] [Indexed: 05/15/2023]
Abstract
Mercury bromide (Hg2Br2) has been used to develop acousto-optic tunable filters (AOTFs) because it has several advantages, including a high refractive index, a broad optical bandwidth, and a relatively high figure of merit. Therefore, the measurement of its birefringence is a highly important factor for ensuring AOTF quality. However, for single crystals, it is difficult (at the millimeter scale) to quantify the birefringence using an ellipsometer, as this equipment is only designed to conduct measurements on thin films. In this study, a simple birefringence measurement system for Hg2Br2 was developed based on Brewster's angle at the millimeter scale. The planar distributions of the Hg2Br2 crystal along the (100), (010), and (001) planes were used in the experiments. The developed measurement system can measure the reflected light intensity of the Hg2Br2 crystal depending on the incidence angles (rotations at 0.01125° steps) and can calculate the ordinary and extraordinary refractive indices and birefringence. The calculated birefringence of the Hg2Br2 crystal was 0.8548; this value exhibits an error of 0.64% compared with a value of 0.86 reported in the literature. The developed measurement system demonstrates the ability to be used to evaluate the quality of birefringent single crystals.
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Affiliation(s)
- Oh-Tae Kwon
- Department of Biosystem Machinery Engineering, College of Agricultural and Life Science, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, Republic of Korea
| | - Geonwoo Kim
- Department of Biosystem Bio-Industrial Machinery Engineering, College of Agricultural and Life Science, Gyeongsang National University, 501 Jinju-daero, Jinju 52828, Republic of Korea
- Institute of Agriculture and Life Science, Gyeongsang National University, Jinju 52828, Republic of Korea
| | - Hyungjin Bae
- Department of Biosystem Machinery Engineering, College of Agricultural and Life Science, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, Republic of Korea
| | - Jaeyeol Ryu
- Department of Space Optics R&D, Green Optics, 45, Ganri 1-gil, Cheongwon-gu, Cheongju 28126, Republic of Korea
| | - Sikwan Woo
- Department of Space Optics R&D, Green Optics, 45, Ganri 1-gil, Cheongwon-gu, Cheongju 28126, Republic of Korea
| | - Byoung-Kwan Cho
- Department of Biosystem Machinery Engineering, College of Agricultural and Life Science, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, Republic of Korea
- Department of Smart Agricultural System, College of Agricultural and Life Science, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, Republic of Korea
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