We designed and built a measuring system to detect a very small optical rotation. The total measuring system consists of
a laser, a Faraday modulator, a photo-detector, and a lock-in amplifier. To test the sensitivity of the system, we built
another system to generate the small polarization rotation angle. The rotation-generating system includes a dense coil
around a magneto-optic crystal, a power amplifier working at modulation frequency about 1 kHz. The rotationgenerating
system can drive probe beam polarization by 2°due to the Faraday effect under 0-2 kHz modulation
frequency. We monitor the frequency and amplitude of the modulating signal by observing the second harmonic signal
received by the photo-detector. Some factors which influence the detection system have been analyzed experimentally to
found the best working setup of the system. Recently we can detect an angle of magnitude at 10-6rad and the SNR of the
output of the lock-in amplifier is above 331.The resolution of the angle detection is better than 10-7rad.
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