Journal
OPTICS LETTERS
Volume 27, Issue 20, Pages 1788-1790Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.27.001788
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Single-frequency operation of a 10.4-mum. room-temperature multimode quantum-cascade laser was achieved by use of a 17-mm. short Littrow-type external-cavity configuration. The spectral intensity of the external-cavity laser was increased as much as 20-fold compared with that of a multimode quantum-cascade laser without an external cavity. A single-frequency tuning range of 76 nm (7 cm(-1)) was achieved. The results were obtained without antireflection. coating of the laser output facet. (C) 2002 Optical Society of America.
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