• Optical Instruments
  • Vol. 37, Issue 6, 475 (2015)
CAO Jianghui*, JIA Hongzhi, CAO Junjie, YOU Bei, and WANG Liao
Author Affiliations
  • [in Chinese]
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    DOI: 10.3969/j.issn.1005-5630.2015.06.002 Cite this Article
    CAO Jianghui, JIA Hongzhi, CAO Junjie, YOU Bei, WANG Liao. Optical rotation angle detection based on the lock-in amplifier and magneto-optical modulation[J]. Optical Instruments, 2015, 37(6): 475 Copy Citation Text show less

    Abstract

    According to Faraday effect and lock-in amplification principle, the magneto-optical modulation of polarized light through an optical material occurs after deflection. The output light contains a fundamental signal and a frequency-doubled signal whose frequencies are equal and doubled to modulation frequency respectively. Based on the analyses of amplitudes of fundamental and frequency-doubled signals, we put forward an algorithm for measuring the rotation angle. According to the relation between optical rotation angle and magnetic declination, we put forward a method to calibrate the magnetic declination in the Faraday magneto-optic effect. The feasibility of such measurement approach has been verified by our experiments.
    CAO Jianghui, JIA Hongzhi, CAO Junjie, YOU Bei, WANG Liao. Optical rotation angle detection based on the lock-in amplifier and magneto-optical modulation[J]. Optical Instruments, 2015, 37(6): 475
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