Broadly tunable mid-infrared noise-immune cavity-enhanced optical heterodyne molecular spectrometer

Michael W. Porambo, Brian M. Siller, Jessica M. Pearson, Benjamin J. McCall

Research output: Contribution to journalArticle

Abstract

The sensitive spectroscopic technique noise-immune cavity-enhanced optical heterodyne molecular spectroscopy (NICE-OHMS) has been successfully used in a variety of systems; however, no broadly tunable setup has been developed for the mid-infrared. To this end, we have integrated a difference frequency generation system into a NICE-OHMS setup. Initial optimization and characterization was completed with ro-vibrational spectroscopy of methane. Doppler-broadened frequency-modulated NICE-OHMS spectra were recorded at a sensitivity of2 × 10-7 cm-1 Hz-1/2. Sub-Doppler saturation signals (Lamb dips) were also observed using wavelength-modulated NICE-OHMS, achieving a sensitivity of ∼6 × 10-9 cm-1 Hz-1 /2.

Original languageEnglish (US)
Pages (from-to)4422-4424
Number of pages3
JournalOptics Letters
Volume37
Issue number21
DOIs
StatePublished - Nov 1 2012

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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