Optical frequency comb spectroscopy at 3-5.4 μm with a doubly resonant optical parametric oscillator

Abstract

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 Vernier spectrometer. Using the FTS with a multipass cell we measure high-precision broadband absorption spectra of CH${}_4$ and NO at ~3.3 μm and ~5.2 μm, respectively, and of atmospheric species (CH${}_4$, CO, CO${}_2$ and H${}_2$O) in air in the signal and idler wavelength range. The figure of merit of the system is on the order of 10${}^{-8}$ cm${}^{-1}$ Hz${}^{-1/2}$ per spectral element, and multiline fitting yields minimum detectable concentrations of 10-20 ppb Hz${}^{-1/2}$ for CH${}_4$, NO and CO. For the first time in the mid-infrared, we perform continuous-filtering Vernier spectroscopy using a low finesse enhancement cavity, a grating and a single detector, and measure the absorption spectrum of CH${}_4$ and H${}_2$O in ambient air at ~3.3 μm.

References in corpus (2)

• Mid-Infrared Frequency Comb Fourier Transform Spectrometer
• Surpassing the Path-Limited Resolution of a Fourier Transform Spectrometer with Frequency Combs

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