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

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

doi:10.1364/OL.37.004422

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

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

Chemistry

Research output: Contribution to journal › Article › peer-review

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 language	English (US)
Pages (from-to)	4422-4424
Number of pages	3
Journal	Optics Letters
Volume	37
Issue number	21
DOIs	https://doi.org/10.1364/OL.37.004422
State	Published - Nov 1 2012

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics

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10.1364/OL.37.004422

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title = "Broadly tunable mid-infrared noise-immune cavity-enhanced optical heterodyne molecular spectrometer",

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.",

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

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