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11 May 2004 Mid-infrared "W" diode lasers and their application to methane sensing
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Mid-infrared “W” quantum-well diode lasers with reduced turn-on voltages are reported. Devices with coated facets operated in continuous-wave mode up to 195 K, where the emission wavelength was 3.56 microns. At 78 K the threshold current density was 67 A/cm2, the maximum output power was 198 mW, and the maximum slope efficiency was 106 mW/A. One of these lasers was used to detect methane, by exploiting the absorption band in the vicinity of 3.3 microns. Preliminary measurements demonstrated detection of methane at partial pressures down to 7 x 10-7 atm. in a nitrogen atmosphere.
© (2004) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
William W. Bewley, Chadwick L. Canedy, Chulsoo Kim, Igor Vurgaftman, Mijin Kim, Jerry R. Meyer, Jongjin G. Kim, Ramon U. Martinelli, and Roger C. Farmer "Mid-infrared "W" diode lasers and their application to methane sensing", Proc. SPIE 5365, Novel In-Plane Semiconductor Lasers III, (11 May 2004);


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