Room-temperature diode laser photoacoustic spectroscopy near 2.3 mm

• Published in: Applied physics. B, Lasers and optics Vol. 81; no. 6; pp. 857 - 861
• Main Authors: Civis, S, Horka, V, Cihelka, J, Simecek, T, Hulicius, E, Oswald, J, Pangrac, J, Vicet, A, Rouillard, Y, Salhi, A, Alibert, C, Werner, R, Koeth, J
• Format: Journal Article
• Language: English
• Published: 01-10-2005
• Subjects: Air pollution; Ammonia; Lasers; Methane; Photoacoustic spectroscopy; Quantum well lasers; Semiconductors; Spectra
• ISSN: 0946-2171; 1432-0649
• DOI: 10.1007/s00340-005-1950-y

We describe results obtained with a new type of GaSb-based semiconductor distributed feedback multiple quantum well lasers operating in continuous-wave mode at room temperature and above. The lasers show good tunability both by the excitation current and the temperature from -1 C to +60 C (4170 to 4360 cm). They operate in a high-power (more than 1 mW) single-mode regime and can be tuned without hopping in the methane and ammonia absorption spectral range of up to 15 cm. Application to photoacoustic detection is also described. Potential use lies in the areas of analytical chemistry of gases and in atmospheric pollution research.