Chinese Optics Letters, 2018, 16 (8): 081201, Published Online: Aug. 2, 2018
Noise reduction and signal to noise ratio improvement in magneto-optical polarization rotation measurement 
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Fig. 1. Polarization rotation measurement system using Faraday modulator. P, polarizer; FM, Faraday modulator; C, rotation generating cell; A, analyzer; PD, photodetector; LIA, lock-in amplifier.
Fig. 2. 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.
Fig. 3. Variation in the axial magnetic field of the solenoid coil of the Faraday modulator.
Fig. 4. Measurement of the Verdet constant of TGG magneto-optic glass using the differential measurement system.
Fig. 5. 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.
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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