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 nmK-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. © 2004 Elsevier B.V. All rights reserved.
Keywords: Semiconductor lasers ; Photoacoustic spectroscopy ; Distributed feedback lasers ; Quantum theory ; Gas lasers ; Light absorption ; Laser applications ; Molecular beam epitaxy ; Optical communication ; Photodiodes
Lab. of Nanophotonics and Metrology, Swiss Fed. Institute of Technology, CH-1015 Lausanne, Switzerland Compilation and indexing terms, Copyright 2008 Elsevier Inc. 04518721522 1386-1425 Antimonide Trace gas monitoring Single-mode emission Photoacoustic (PA)
Record created on 2008-09-29, modified on 2016-08-08