TITLE

Optical enhancement of diode laser-photoacoustic trace gas detection by means of external Fabry-Perot cavity

AUTHOR(S)
Rossi, Alessandro; Buffa, Roberto; Scotoni, Mario; Bassi, Davide; Iannotta, Salvatore; Boschetti, Andrea
PUB. DATE
July 2005
SOURCE
Applied Physics Letters;7/25/2005, Vol. 87 Issue 4, p041110
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
An optical enhancement method applied to a diode laser photoacoustic trace gas detector is presented. In order to improve the detection sensitivity, the light intensity inside the acoustic resonator is amplified using a Fabry-Perot cavity. A feedback signal stabilizes the laser frequency to the optical cavity length, in order to maintain the light amplification constant during the probe frequency scan. The usefulness of the optical amplifier is demonstrated by showing two ethylene spectra obtained at 1.624 μm with and without the optical enhancement. Tens to hundreds ppb (part per billion) sensibility for molecules absorbing in the region between 1.5–1.7 μm can be obtained.
ACCESSION #
17782551

 

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