Application of antimonide diode lasers in photoacoustic spectroscopy.
First investigations of photoacoustic (PA) spectroscopy (PAS) of methane using an antimonide semiconductor laser are reported. The laser fabrication is made in two steps. The structure is firstly grown by molecular beam epitaxy, then a metallic distributed-feedback (DFB) grating is processed. The laser operates at 2371.6 nm in continuous wave and at room temperature. It demonstrates single-mode emission with typical tuning coefficients of 0.04 nm mA(-1) and 0.2 nm K(-1). PA detection of methane was performed by coupling this laser into a radial PA cell. A detection limit of 20 ppm has been achieved in a preliminary configuration that was not optimised for the laser characteristics.
Schilt
Stéphane
S
Laboratory of Nanophotonics and Metrology, Swiss Federal Institute of Technology, CH-1015 Lausanne, Switzerland. stephane.schilt@epfl.ch
Vicet
Aurore
A
Werner
Ralph
R
Mattiello
Mario
M
Thévenaz
Luc
L
Salhi
Abdelmajid
A
Rouillard
Yves
Y
Koeth
Johannes
J
D000965:Antimony; D002623:Chemistry Techniques, Analytical / Q000295:instrumentation / Q000379:methods*; D007834:Lasers; D013057:Spectrum Analysis / Q000295:instrumentation / Q000379:methods; D013997:Time Factors
D000965:Antimony