Abstract

The reduction of the residual amplitude modulation (RAM) induced by electro-optic modulation is essential for many applications of frequency modulation spectroscopy requiring a lower system noise floor. Here, we demonstrate a simple passive approach employing an electro-optic modulator (EOM) cut at Brewster’s angle. The proposed EOM exhibits a RAM of a few parts per million, which is comparable with that achieved by a common EOM under critical active temperature and bias voltage controls. The frequency instability of a 10 cm cavity-stabilized laser induced by the RAM effect of the proposed EOM is below $3\times {10}^{-17}$ for integration times from 1 to 1000 s, and below $4\times {10}^{-16}$ for comprehensive noise contributions for integration times from 1 to 100 s.

© 2016 Optical Society of America

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