Title :
Methane sensing with a novel micromachined single-frequency Fabry-Perot laser diode emitting at 1331 nm
Author :
Weldon, V. ; O´Gorman, James ; Perez-Camacho, J.J. ; McDonald, D. ; Hegarty, J. ; Corbett, B.
Author_Institution :
Optronics, Trinity Coll., Dublin, Ireland
fDate :
3/1/1997 12:00:00 AM
Abstract :
Spectroscopic-based gas sensing is demonstrated using micromachined single-frequency Fabry-Perot (FP) laser diodes emitting at 1.331 μm with a side mode suppression ratio of greater than 24 dB over a significant emission wavelength tuning range. The utility of these novel mode controlled FP lasers for spectroscopic detection of gases is assessed by investigating the methane-absorption band in the 1.33 μm region. By probing the narrow linewidth R2 rotational absorption line, we demonstrate a low gas detection limit of 28 ppm/spl middot/m and confirm the suitability of micromachined lasers in such applications.
Keywords :
gas sensors; infrared sources; laser frequency stability; laser modes; laser transitions; laser tuning; measurement by laser beam; micromachining; modulation spectroscopy; rotational states; semiconductor lasers; spectral line breadth; spectrochemical analysis; 1.33 mum; 1331 nm; emission wavelength tuning range; gas sensors; low gas detection limit; methane sensing; methane-absorption band; micromachined lasers; micromachined single-frequency Fabry-Perot laser diode; micromachined single-frequency Fabry-Perot laser diodes; narrow linewidth R2 rotational absorption line; side mode suppression ratio; spectroscopic detection; spectroscopic-based gas sensing; Absorption; Diode lasers; Fabry-Perot; Gas lasers; Gases; Laser applications; Laser modes; Laser tuning; Optical control; Spectroscopy;
Journal_Title :
Photonics Technology Letters, IEEE
