Pound-Drever-Hall-locked, frequency-stabilized cavity ring-down spectrometer

Cygan, A.; Lisak, D.; Masłowski, P.; Bielska, K.; Wójtewicz, S.; Domysławska, J.; Trawinski, R. S.; Ciuryło, R.; Abe, H.; Hodges, J. T.
June 2011
Review of Scientific Instruments;Jun2011, Vol. 82 Issue 6, p063107
Academic Journal
We describe a high sensitivity and high spectral resolution laser absorption spectrometer based upon the frequency-stabilized cavity ring-down spectroscopy (FS-CRDS) technique. We used the Pound-Drever-Hall (PDH) method to lock the probe laser to the high-finesse ring-down cavity. We show that the concomitant narrowing of the probe laser line width leads to dramatically increased ring-down event acquisition rates (up to 14.3 kHz), improved spectrum signal-to-noise ratios for weak O2 absorption spectra at λ = 687 nm and substantial increase in spectrum acquisition rates compared to implementations of FS-CRDS that do not incorporate high-bandwidth locking techniques. The minimum detectable absorption coefficient and the noise-equivalent absorption coefficient for the spectrometer are about 2×10-10 cm-1 and 7.5×10-11 cm-1Hz-1/2, respectively.


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