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Time-resolved characterization of external-cavity quantum-cascade lasers

: Hinkov, B.; Yang, Q.; Fuchs, F.; Bronner, W.; Köhler, K.; Wagner, J.


Applied Physics Letters 94 (2009), Nr.22, Art. 221105, 3 S.
ISSN: 0003-6951
ISSN: 1077-3118
Fraunhofer IAF ()
quantum cascade laser

We report on the temporal and spectral evolution of the lasing spectrum of an external-cavity quantum-cascade (QC) laser operated in pulsed mode. Time-resolved lasing spectra, recorded on nanosecond time scale, revealed that after turn-on of the 100 ns current pulse multiple-mode lasing starts at the gain maximum of the QC laser controlled by the cavity formed by the chip facets. Depending on the spectral tuning after a time delay of 15-35 ns, the QC laser couples to the external cavity as seen from a change in lasing wavelength to that defined by the external grating as wavelength selective element.