Widely-tunable Mid-infrared Fiber-coupled Quartz-enhanced Photoacoustic Sensor for Environmental Monitoring

Overview

Journal Opt Express

Specialties Biophysics
Ophthalmology

Date 2014 Nov 18

PMID 25402062

Citations 11

Authors

M Siciliani de Cumis

S Viciani

S Borri

P Patimisco

A Sampaolo

G Scamarcio

P De Natale

F DAmato

V Spagnolo

Affiliations

Soon will be listed here.

Abstract

A compact widely-tunable fiber-coupled sensor for trace gas detection of hydrogen sulfide (H₂S) in the mid infrared is reported. The sensor is based on an external-cavity quantum cascade laser (EC-QCL) tunable between 7.6 and 8.3 μm wavelengths coupled into a single-mode hollow-core waveguide. Quartz-enhanced photoacoustic spectroscopy has been selected as detecting technique. The fiber coupling system converts the astigmatic beam exiting the laser into a TEM(00) mode. During a full laser scan, we observed no misalignment between the optical beam and the tuning fork, thus making our system applicable for multi-gas or broad absorber detections. The sensor has been tested on N₂:H₂S gas mixtures. The minimum detectable H₂S concentration is 450 ppb in ~3 s integration time, which is the best value till now reported in literature for H₂S optical sensors.

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