Sensitive Faraday rotation measurement with auto-balanced photodetection.

@article{Chang2011SensitiveFR,
  title={Sensitive Faraday rotation measurement with auto-balanced photodetection.},
  author={Chia-Yu Chang and Likarn Wang and J. T. Shy and Chu-En Lin and Chien Chou},
  journal={The Review of scientific instruments},
  year={2011},
  volume={82 6},
  pages={
          063112
        }
}
A magneto-optic polarimetry based on auto-balanced photodetection is investigated. In this experiment, a commercial auto-balanced photoreceiver is adopted to measure the Faraday rotation of air. With a proper setup to utilize its noise cancellation capability, the measurement can be flexible and sensitive. The angular sensitivity is 2.99×10(-8) rad Hz(-1/2), which is about 2.7 times the shot noise limit. The measured Verdet constant of air is +1.39×10(-9) rad G(-1) cm(-1) at 634.8 nm… 
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