External cavity diode laser-based detection of trace gases with NICE-OHMS using current modulation

External cavity diode laser-based detection of trace gases with NICE-OHMS using current modulation

We combine an external cavity diode laser with noise-immune cavity-enhanced optical heterodyne molecular spectroscopy (NICE-OHMS) using current modulation. With a finesse of 1600, we demonstrate noise equivalent absorption sensitivities of 4.1 x 10(-10) cm(-1) Hz(-1/2), resulting in sub-ppbv detecti...

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Veröffentlicht in:Optics express 2015-03, Vol.23 (5), p.6277-6282
Hauptverfasser: Centeno, R, Mandon, J, Cristescu, S M, Axner, O, Harren, F J M
Format: Artikel
Sprache:eng
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Zusammenfassung:We combine an external cavity diode laser with noise-immune cavity-enhanced optical heterodyne molecular spectroscopy (NICE-OHMS) using current modulation. With a finesse of 1600, we demonstrate noise equivalent absorption sensitivities of 4.1 x 10(-10) cm(-1) Hz(-1/2), resulting in sub-ppbv detection limits for Doppler-broadened transitions of CH(4) at 6132.3 cm(-1), C(2)H(2) at 6578.5 cm(-1) and HCN at 6541.7 cm(-1). The system is used for hydrogen cyanide detection from sweet almonds.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.23.006277