Intervalley carrier transfer in short-wavelength InP-based quantum-cascade laser
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(a) Conduction band profile of a single cascade within the active region of the QCL with a 90 kV/cm bias (for ). The moduli squared of injector/extractor miniband state wave functions and their excited states are shown in gray. The moduli squared of the wave functions associated with the upper 2 and the lower 1 laser states are drawn with solid black lines. (b) Emission spectra of the QCL measured at various magnetic fields , as indicated, and slightly different currents . For the currents and fields shown, the laser emission energy remains almost constant, .
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(a) Emitted laser power as a function of the magnetic field for several drive currents, as indicated. The black curves correspond to measurements with the resistive magnet coil, up to 33 T. The gray curves represent measurements with a hybrid magnet, up to 45 T. The vertical arrows indicate magnetic fields resulting in local minima in the laser emission power. (b) Landau-level energies as functions of magnetic field for the Landau levels associated with the lower laser level and for the Landau levels of the upper laser level 2. Zero energy is taken at the -point of . Black and gray circles denote low-frequency and high-frequency resonances, discussed in the text.
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