Fourier transform and Vernier spectroscopy using an optical frequency comb at 3-5.4  μm

We present a versatile mid-infrared frequency comb spectroscopy system based on a doubly resonant optical parametric oscillator tunable in the 3-5.4 μm range and two detection methods: a Fourier transform spectrometer (FTS) and a continuous-filtering Vernier spectrometer (CF-VS). Using the FTS with...

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Bibliographic Details
Published in:Optics letters 2016-06, Vol.41 (11), p.2541-2544
Main Authors: Khodabakhsh, Amir, Ramaiah-Badarla, Venkata, Rutkowski, Lucile, Johansson, Alexandra C, Lee, Kevin F, Jiang, Jie, Mohr, Christian, Fermann, Martin E, Foltynowicz, Aleksandra
Format: Article
Language:English
Subjects:
Absorption spectra
Atmospherics
Broadband
Carbon monoxide
Detectors
Gratings (spectra)
Physics
Spectroscopy
Time measurement
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Summary:We present a versatile mid-infrared frequency comb spectroscopy system based on a doubly resonant optical parametric oscillator tunable in the 3-5.4 μm range and two detection methods: a Fourier transform spectrometer (FTS) and a continuous-filtering Vernier spectrometer (CF-VS). Using the FTS with a multipass cell, we measure high precision broadband absorption spectra of CH at 3.3 μm and NO at 5.25 μm, the latter for the first time with comb spectroscopy, and we detect atmospheric species (CH , CO, CO , and H O) in air in the signal and idler ranges. Multiline fitting yields minimum detectable concentrations of 10-20  ppb Hz for CH , NO, and CO. For the first time in the mid-infrared, we perform CF-VS using an enhancement cavity, a grating, and a single detector, and we measure the absorption spectrum of CH and H O in ambient air at ∼3.3  μm, reaching a 40 ppb concentration detection limit for CH in 2 ms.
ISSN:0146-9592
1539-4794
1539-4794
DOI:10.1364/OL.41.002541