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  • Received: Apr. 24, 2018

    Accepted: Jun. 6, 2018

    Posted: Jan. 17, 2019

    Published Online: Aug. 2, 2018

    The Author Email: Ming Ding (mingding@buaa.edu.cn)

    DOI: 10.3788/COL201816.081201

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

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Chinese Optics Letters, Vol. 16, Issue 8, 081201 (2018)

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

Muhammad Basharat, Ming Ding*, Yang Li, Hongwei Cai, and Jiancheng Fang

Author Affiliations

  • School of Instrumentation Science & Opto-Electronics Engineering, Beihang University, Beijing 100191, China

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.