Schilt Stéphane, Vicet Aurore, Werner Ralph, Mattiello Mario, Thévenaz Luc, Salhi Abdelmajid, Rouillard Yves, Koeth Johannes
Laboratory of Nanophotonics and Metrology, Swiss Federal Institute of Technology, CH-1015 Lausanne, Switzerland.
Spectrochim Acta A Mol Biomol Spectrosc. 2004 Dec;60(14):3431-6. doi: 10.1016/j.saa.2003.11.045.
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.
报道了首次使用锑化物半导体激光器对甲烷进行光声（PA）光谱（PAS）研究。激光器的制造分两步进行。首先通过分子束外延生长结构，然后加工金属分布反馈（DFB）光栅。该激光器在连续波模式下于室温下在2371.6 nm波长工作。它表现出单模发射，典型调谐系数为0.04 nm mA⁻¹和0.2 nm K⁻¹。通过将此激光器耦合到径向PA池中对甲烷进行PA检测。在未针对激光特性进行优化的初步配置中已实现20 ppm的检测限。
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