Noise immune cavity enhanced optical heterodyne velocity modulation spectroscopy

Brian M. Siller, Michael W. Porambo, Andrew A. Mills, Benjamin J. McCall

Research output: Contribution to journalArticlepeer-review


The novel technique of cavity enhanced velocity modulation spectroscopy has recently been demonstrated as the first general absorption technique that allows for sub-Doppler spectroscopy of molecular ions while retaining ion-neutral discrimination. The previous experimental setup has been further improved with the addition of heterodyne detection in a NICE-OHMS setup. This improves the sensitivity by a factor of 50 while retaining sub-Doppler resolution and ion-neutral discrimination. Calibration was done with an optical frequency comb, and line centers for several N+2 lines have been determined to within an accuracy of 300 kHz.

Original languageEnglish (US)
Pages (from-to)24822-24827
Number of pages6
JournalOptics Express
Issue number24
StatePublished - Nov 21 2011

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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