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Updated: Apr 15, 2026

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Construction and Characterization of External Cavity Diode Lasers for Atomic Physics
Published on: April 24, 2014
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External cavity diode laser-based detection of trace gases with NICE-OHMS using current modulation
Optics Express
|April 4, 2015
Abstract:
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.
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