Electro-optic modulator with ultra-low residual amplitude modulation for frequency modulation and laser stabilization

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...

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Published inOptics letters Vol. 41; no. 23; p. 5584
Main Authors Tai, Zhaoyang, Yan, Lulu, Zhang, Yanyan, Zhang, Xiaofei, Guo, Wenge, Zhang, Shougang, Jiang, Haifeng
Format Journal Article
LanguageEnglish
Published United States 01.12.2016
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Summary: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 3×10 for integration times from 1 to 1000 s, and below 4×10 for comprehensive noise contributions for integration times from 1 to 100 s.
ISSN:1539-4794
DOI:10.1364/OL.41.005584