Journal
OPTICS LETTERS
Volume 42, Issue 19, Pages 3984-3987Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.42.003984
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Funding
- National Natural Science Foundation of China (NSFC) [61327812, 61735015, 61775132]
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An electro-optic frequency comb enables frequency-agile comb-based spectroscopy without using sophisticated phase-locking electronics. Nevertheless, dense electro-optic frequency combs over broad spans have yet to be developed. In this Letter, we propose a straightforward and efficient method for electro-optic frequency comb generation with a small line spacing and a large span. This method is based on two-stage modulation: generating an 18 GHz line-spacing comb at the first stage and a 250 MHz line-spacing comb at the second stage. After generating an electro-optic frequency comb covering 1500 lines, we set up an easily established mutually coherent hybrid dual-comb interferometer, which combines the generated electro-optic frequency comb and a free-running mode-locked laser. As a proof of concept, this hybrid dual-comb interferometer is used to measure the absorption and dispersion profiles of the molecular transition of (HCN)-C-13 with a spectral resolution of 250 MHz. (C) 2017 Optical Society of America
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