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Science. 2002 Jan 11;295(5553):301-5. Epub 2001 Dec 20.

Continuous wave operation of a mid-infrared semiconductor laser at room temperature.

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  • 1Institute of Physics, University of Neuch√Ętel, CH-2000 Neuch√Ętel, Switzerland.


Continuous wave operation of quantum cascade lasers is reported up to a temperature of 312 kelvin. The devices were fabricated as buried heterostructure lasers with high-reflection coatings on both laser facets, resulting in continuous wave operation with optical output power ranging from 17 milliwatts at 292 kelvin to 3 milliwatts at 312 kelvin, at an emission wavelength of 9.1 micrometers. The results demonstrate the potential of quantum cascade lasers as continuous wave mid-infrared light sources for high-resolution spectroscopy, chemical sensing applications, and free-space optical communication systems.

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