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Opt Lett. 2012 Nov 1;37(21):4422-4. doi: 10.1364/OL.37.004422.

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

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  • 1Department of Chemistry, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA.


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 of 2×10(-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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