Mid-infrared continuous-filtering Vernier spectroscopy using a doubly resonant optical parametric oscillator
[PHYS]Physics [physics]
Physics - Instrumentation and Detectors
Atom and Molecular Physics and Optics
Optical frequency comb spectroscopy
FOS: Physical sciences
Atom- och molekylfysik och optik
Instrumentation and Detectors (physics.ins-det)
Molecular physics
Physics - Optics
Optics (physics.optics)
DOI:
10.1007/s00340-017-6781-0
Publication Date:
2017-07-10T09:50:25Z
AUTHORS (4)
ABSTRACT
We present a continuous-filtering Vernier spectrometer operating in the 3.15-3.4 $��$m range, based on a femtosecond doubly resonant optical parametric oscillator, a cavity with a finesse of 340, a grating mounted on a galvo scanner and two photodiodes. The spectrometer allows acquisition of one spectrum spanning 250 nm of bandwidth in 25 ms with 8 GHz resolution, sufficient for resolving molecular lines at atmospheric pressure. An active lock ensures good frequency and intensity stability of the consecutive spectra and enables continuous signal acquisition and efficient averaging. The relative frequency scale is calibrated using a Fabry-Perot etalon or, alternatively, the galvo scanner position signal. We measure spectra of pure CH${_4}$ as well as dry and laboratory air and extract CH${_4}$ and H${_2}$O concentrations by multiline fitting of model spectra. The figure of merit of the spectrometer is 1.7x10${^-}$${^9}$ cm${^-}$${^1}$ Hz${^-}$${^1}$${^/}$${^2}$ per spectral element and the minimum detectable concentration of CH${_4}$ is 360 ppt Hz${^-}$${^1}$${^/}$${^2}$, averaging down to 90 ppt after 16 s.
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