Abstract

We report the operation of a 50mW continuous-wave quantum cascade laser (QCL) in the 9.2μm range, phase locked to a single-mode CO2 laser with a tunable frequency offset. The wide free-running emission spectrum of the QCL (35MHz) is strongly narrowed down to the kilohertz range, making it suitable for high-resolution molecular spectroscopy.

© 2007 Optical Society of America

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