Quantum cascade (QC) lasers with a dual-wavelength interdigitated cascade are presented. Their active core consists of a stack of active regions and injectors emitting at 8.0 /spl mu/m interleaved with a second stack emitting at 9.5 /spl mu/m. Laser action at two substantially different wavelengths is observed, demonstrating the viability of the "interdigitated cascade" approach for multi-wavelength laser emission in the mid-infrared. This laser was also used to investigate the influence of the injector-doping on the device performance. Two QC lasers with different injector-doping levels were measured, in particular one only doped in the injectors bridging the 8.0 /spl mu/m active region to the 9.5 /spl mu/m active region and the remaining injectors undoped. A substantial reduction in threshold was observed for the laser wavelength with the undoped injector, confirming the significance of impurity scattering for the laser threshold in QC-lasers. Dual single-mode and tunable emission at two substantially different wavelength could be demonstrated with a QC laser emitting at 5.0 /spl mu/m and 7.5 /spl mu/m simultaneously. These lasers may be of interest for trace gas sensing, as the second wavelength could be used as in-built reference channel.


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    Title :

    Two-wavelength quantum cascade lasers with heterogeneous cascades


    Contributors:
    Straub, A. (author) / Gmachl, C. (author) / Mosely, T.S. (author) / Colombelli, R. (author) / Troccoli, M. (author) / Sivco, D.L. (author) / Sergent, A.M. (author) / Capasso, F. (author) / Cho, A.Y. (author)


    Publication date :

    2002-01-01


    Size :

    278967 byte





    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English



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