Coherent, multi-heterodyne spectroscopy using stabilized optical frequency combs

Details Coherent, multi-heterodyne spectroscopy using stabilized optical frequency combs Coherent, multi-heterodyne spectroscopy using stabilized optical frequency combs

2007-10-17

arxiv.org/abs/0710.3404v1

Physics

Optics

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.100.013902

The broadband, coherent nature of narrow-linewidth fiber frequency combs is exploited to measure the full complex spectrum of a molecular gas through multi-heterodyne spectroscopy. We measure the absorption and phase shift experienced by each of 155,000 individual frequency comb lines, spaced by 100 MHz and spanning from 1495 nm to 1620 nm, after passing through a hydrogen cyanide gas. The measured phase spectrum agrees with Kramers-Kronig transformation of the absorption spectrum. This technique can provide a full complex spectrum rapidly, over wide bandwidths, and with hertz-level accuracy.

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