Abstract

Continuous-wave operation of an external cavity quantum-cascade laser on a thermoelectric cooler is reported. The active region of the gain element was based on a bound-to-continuum design emitting near 5.15μm. The external cavity setup was arranged in a Littrow configuration. The front facet of the gain chip was antireflection coated. The laser could be tuned over more than 170cm1 from 4.94to5.4μm and was single mode over more than 140cm1. The output power was in excess of 10mW over 100cm1 and in excess of 5mW over 130cm1 at 30°C.

© 2005 Optical Society of America

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