Continuous wave optical parametric oscillator for quartz-enhanced photoacoustic trace gas sensing

A continuous wave optical parametric oscillator, generating up to 300 mW idler output in the 3--4 Delta *mm wavelength region, and pumped by a fiber-amplified DBR diode laser is used for trace gas detection by means of quartz-enhanced photoacoustic spectroscopy (QEPAS). Mode-hop-free tuning of the O...

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Bibliographic Details
Published in:Applied physics. B, Lasers and optics Lasers and optics, 2007-10, Vol.89 (1), p.123-128, Article 123
Main Authors: NGAI', A. K. Y, PERSIJN, S. T, LINDSAY, I. D, KOSTEREV, A. A, GROSS, P, LEE, C. J, CRISTESCU, S. M, TITTEL, F. K, BOLLER, K.-J, HARREN, F. J. M
Format: Article
Language:English
Subjects:
Biological and medical applications
Continuous wave
Diode lasers
Ethane
Exact sciences and technology
Fiber lasers
Fundamental areas of phenomenology (including applications)
General equipment and techniques
Idlers
Instruments, apparatus, components and techniques common to several branches of physics and astronomy
Laser spectroscopy
Lasers
Nonlinear optics
Optical Parametric Oscillators
Optical parametric oscillators and amplifiers
Optics
Physics
Pumps
Sensors (chemical, optical, electrical, movement, gas, etc.)
remote sensing
Tuning
Wavelengths
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Summary:A continuous wave optical parametric oscillator, generating up to 300 mW idler output in the 3--4 Delta *mm wavelength region, and pumped by a fiber-amplified DBR diode laser is used for trace gas detection by means of quartz-enhanced photoacoustic spectroscopy (QEPAS). Mode-hop-free tuning of the OPO output over 5.2 cm-1 and continuous spectral coverage exceeding 16.5 cm-1 were achieved via electronic pump source tuning alone. Online monitoring of the idler wavelength, with feedback to the DBR diode laser, provided an automated closed-loop control allowing arbitrary idler wavelength selection within the pump tuning range and locking of the idler wavelength with a stability of 1.7X10-3 cm-1 over at least 30 min. Using this approach, we locked the idler wavelength at an ethane absorption peak and obtained QEPAS data to verify the linear response of the QEPAS signal at different ethane concentrations (100 ppbv-20 ppmv) and different power levels. The detection limit for ethane was determined to be 13 ppbv (20 s averaging), corresponding to a normalized noise equivalent absorption coefficient of 4.4X10-7 cm-1 W/Hz1/2.
ISSN:0946-2171
1432-0649
DOI:10.1007/s00340-007-2755-y