We report the operation of a 50 mW continuous-wave quantum cascade laser (QCL) in the 9.2 (mu)m range,phase locked to a single-mode CO_(2) laser with a tunable frequency offset. The wide free-running emission spectrum of the QCL (3-5 MHz) is strongly narrowed down to the kilohertz range, making it suitable for high-resolution molecular spectroscopy.
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