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22 February 2006 Room-temperature continuous-wave single-mode quantum cascade lasers
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We report a realization of single-frequency quantum-cascade lasers in continuous-wave mode on thermo-electrical cooler at frequencies ~ 1830 cm-1 (~ 5.46 μm) and ~ 1900 cm-1 (~ 5.26 μm). The active region of the lasers is based on the broad gain bound-to-continuum concept. We report a 1.5 mm-long, 18 μm-wide quantum-cascade laser exhibiting single-mode emission over the entire investigated temperature and current ranges with a side-mode suppression ratio > 25 dB. Output powers up to 54 mW at -30°C and 1.2 mW at +27°C are demonstrated. A tuning range of 12.8 cm-1 (0.7%) can be obtained between 1823.1 cm-1 and 1835.9 cm-1. A different device, 1.5 mm-long, 12 μm-wide, is reported in the range 1892.8 cm-1 to 1905.5 cm-1, exhibiting output power of 59 mW at -30°C and 0.8 mW at +20°C. The objective of this development is to obtain a room-temperature continuous-wave quantum-cascade laser at 1900cm-1, important for NO (nitric oxide) measurements. We demonstrate also Fabry-Pérot continuous-wave operation of quantum-cascade lasers grown by metal organic vapour phase epitaxy up to -5°C without the need of buried heterostructure processing.
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Stéphane Blaser, Lubos Hvozdara, Yargo Bonetti, Antoine Muller, Andreas Bächle, Stephan Jochum, Stefan Hansmann, Thierry Aellen, Marcella Giovannini, and Jérôme Faist "Room-temperature continuous-wave single-mode quantum cascade lasers", Proc. SPIE 6133, Novel In-Plane Semiconductor Lasers V, 613301 (22 February 2006);

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