22 February 2006 Room-temperature continuous-wave single-mode quantum cascade lasers
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Abstract
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, Stéphane Blaser, Lubos Hvozdara, Lubos Hvozdara, Yargo Bonetti, Yargo Bonetti, Antoine Muller, Antoine Muller, Andreas Bächle, Andreas Bächle, Stephan Jochum, Stephan Jochum, Stefan Hansmann, Stefan Hansmann, Thierry Aellen, Thierry Aellen, Marcella Giovannini, Marcella Giovannini, Jérôme Faist, Jérôme Faist, } "Room-temperature continuous-wave single-mode quantum cascade lasers", Proc. SPIE 6133, Novel In-Plane Semiconductor Lasers V, 613301 (22 February 2006); doi: 10.1117/12.645964; https://doi.org/10.1117/12.645964
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