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Noise reduction and signal to noise ratio improvement in magneto-optical polarization rotation measurement

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Abstract

The measurement of an extremely small magneto-optical polarization rotation angle with high sensitivity is integral to many scientific and technological applications. In this Letter, we have presented a technique based on Faraday modulation combined with the optical differential method to measure an extremely small polarization rotation angle with high sensitivity. The theoretical and experimental results show that common mode noise is reduced appreciably and signal to noise ratio is enhanced. The effectiveness of this technique has been demonstrated by measuring the Verdet constant of terbium gallium garnet glass and measuring the small polarization rotation angle. A sensitivity of enhancement of one order of magnitude has been achieved using differential detection based on Faraday modulation.

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DOI:10.3788/col201816.081201

所属栏目:Instrumentation, measurement and metrology

基金项目:This work was supported by the National Key R&D Program of China (No. 2017YFB0503100) and the National Science Foundation of China (NSFC) (No. 61227902).

收稿日期:2018-04-24

录用日期:2018-06-06

网络出版日期:2018-07-30

作者单位    点击查看

Muhammad Basharat:School of Instrumentation Science & Opto-Electronics Engineering, Beihang University, Beijing 100191, China
Ming Ding:School of Instrumentation Science & Opto-Electronics Engineering, Beihang University, Beijing 100191, China
Yang Li:School of Instrumentation Science & Opto-Electronics Engineering, Beihang University, Beijing 100191, China
Hongwei Cai:School of Instrumentation Science & Opto-Electronics Engineering, Beihang University, Beijing 100191, China
Jiancheng Fang:School of Instrumentation Science & Opto-Electronics Engineering, Beihang University, Beijing 100191, China

联系人作者:Ming Ding(mingding@buaa.edu.cn)

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引用该论文

Muhammad Basharat, Ming Ding, Yang Li, Hongwei Cai, Jiancheng Fang, "Noise reduction and signal to noise ratio improvement in magneto-optical polarization rotation measurement," Chinese Optics Letters 16(8), 081201 (2018)

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