Chinese Optics Letters, Volume. 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 |Show fewer author(s)
Author Affiliations
  • School of Instrumentation Science & Opto-Electronics Engineering, Beihang University, Beijing 100191, China
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    Figures & Tables(5)
    Polarization rotation measurement system using Faraday modulator. P, polarizer; FM, Faraday modulator; C, rotation generating cell; A, analyzer; PD, photodetector; LIA, lock-in amplifier.
    Schematic of the Faraday modulation-based polarization rotation measurement setup using differential detection. P, polarizer; FM, Faraday modulator; NPBS, non-polarizing beam splitter; M, mirror; C, rotation generating cell; A1, A2, analyzers; PD1, PD2, photodetectors; LIA, lock-in amplifier; OSC, oscilloscope.
    Variation in the axial magnetic field of the solenoid coil of the Faraday modulator.
    Measurement of the Verdet constant of TGG magneto-optic glass using the differential measurement system.
    Noise spectra for a small polarization rotation angle using two measurement techniques. The black and red curves correspond to the single beam detection and the optical differential detection, respectively. The low-frequency performance was considerably improved with the optical differential detection method.
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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," Chin. Opt. Lett. 16, 081201 (2018)

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    Paper Information

    Category: Instrumentation, measurement, and metrology

    Received: Apr. 24, 2018

    Accepted: Jun. 6, 2018

    Published Online: Aug. 2, 2018

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

    DOI:10.3788/COL201816.081201

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