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 . 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 from and was single mode over more than . The output power was in excess of over and in excess of over at .
© 2005 Optical Society of America
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