Phys. Rev. Lett. 100, 013902 (2008) [4 pages]Coherent Multiheterodyne Spectroscopy Using Stabilized Optical Frequency CombsSee Also: Erratum
The broadband, coherent nature of narrow-linewidth fiber frequency combs is exploited to measure the full complex spectrum of a molecular gas through multiheterodyne 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 to 1620 nm, after passing through hydrogen cyanide gas. The measured phase spectrum agrees with the Kramers-Kronig transformation of the absorption spectrum. This technique can provide a full complex spectrum rapidly, over wide bandwidths, and with hertz-level accuracy. URL:
http://link.aps.org/doi/10.1103/PhysRevLett.100.013902
DOI:
10.1103/PhysRevLett.100.013902
PACS:
42.62.Fi, 42.30.Rx, 42.55.Wd, 42.62.Eh
See AlsoErratum: Ian Coddington, William C. Swann, and Nathan R. Newbury, Erratum: Coherent Multiheterodyne Spectroscopy Using Stabilized Optical Frequency Combs [Phys. Rev. Lett. 100, 013902 (2008)], Phys. Rev. Lett. 101, 049901 (2008). |
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