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A method to increase fiber extinction ratio based on the influence of mirrors on beam polarization
Author(s): Yuchen Jia; Binquan Zhou; Kaifeng Yin
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Paper Abstract

Atomic sensing devices usually contain fiber coupling systems. A two-mirror fiber coupling system is usually used in our research to couple spatial light into polarization maintaining fiber. In order to improve the axes alignment accuracy and optical extinction ratio of this fiber coupling system for atomic sensing devices, we propose an improved method based on the influence of mirrors on beam polarization. The polarization maintaining fiber can maintain the polarization of linear polarized light only when the polarization direction coincides with the fiber. However, according to theoretical analysis by Jones Matrix and experimental results, we demonstrate that mirrors have non-negligible influence on beam polarization, which causes difficulty in axes alignment. Both dielectrical mirrors and metallic mirrors have influence on the azimuth and ellipticity of polarized light, and the influence of dielectrical mirrors is more remarkable than that of metallic mirrors. Thus we propose to add a half wave plate or a quarter wave plate in the system to compensate for the influence of mirrors, and the extinction ratio of fiber output light is consequently increased. According to the experimental results, our new approach can increase the extinction ratio by about 30dB.

Paper Details

Date Published: 12 December 2018
PDF: 6 pages
Proc. SPIE 10849, Fiber Optic Sensing and Optical Communication, 108490G (12 December 2018); doi: 10.1117/12.2503961
Show Author Affiliations
Yuchen Jia, Beihang Univ. (China)
Binquan Zhou, Beihang Univ. (China)
Kaifeng Yin, Beihang Univ. (China)

Published in SPIE Proceedings Vol. 10849:
Fiber Optic Sensing and Optical Communication
Jie Zhang; Songnian Fu; Qunbi Zhuge; Ming Tang; Tuan Guo, Editor(s)

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