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- Title
The Fabrication of a Distributed-feedback Quantum Cascade Laser Emitting at Around 4.6 µm and its Application in Photoacoustic Detection of Trace CO Gas.
- Authors
TAN, S.; ZHANG, J.-C.; WANG, L.-J.; CHEN, J.-Y.; LIU, J.-Q.; LIU, F.-Q.; WANG, Z.-G.
- Abstract
Photoacoustic (PA) detection of CO gas was demonstrated by using self-designed distributed-feedback quantum cascade laser (DFB-QCL) emitting at around 4.6 µm. Details of the laser fabrication and the PA detection system are described. Single-mode lasers were designed to cover the strong CO absorption lines by using a buried first-order grating. Though the grating period is 0.72 µm which is not the most appropriate period to get the highest performance lasers made from our epitaxial material, single-mode room temperature continuous wave (CW) operation (side-mode suppression ration (SMSR) above 25 dB) and pulsed operation at 70°C were achieved. By using a differential Helmholtz resonant PA cell with 11 cm path length, the PA spectra for different CO concentrations from 120 to 10 µmol/mol were obtained at room temperature.
- Subjects
PHOTOACOUSTIC detectors; DISTRIBUTED feedback lasers; MICROFABRICATION; QUANTUM cascade lasers; TRACE gases
- Publication
Lasers in Engineering (Old City Publishing), 2014, Vol 29, Issue 3/4, p245
- ISSN
0898-1507
- Publication type
Article