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

Hinkov, Borislav; Yang, Quankui; Fuchs, Frank; Bronner, Wolfgang; Köhler, Klaus; Wagner, Joachim
June 2009
Applied Physics Letters;6/1/2009, Vol. 94 Issue 22, p221105
Academic Journal
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.


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