Intersubband lifetime magnetophonon oscillations in AlGaAs and InGaAs:InP quantum cascade lasers

ORAL

Abstract

We investigate the influence of a strong magnetic field on intersubband scattering rates in AlGaAs and InGaAs quantum cascade lasers (QCL). Laser threshold, differential quantum efficiency and laser emission spectra were measured in magnetic fields up to 30T applied perpendicular to the 2D planes. Intersubband magnetophonon effect -- resonant optical phonon non-radiative relaxation, gives rise to the strong oscillations in laser emission. We derived the magnetic field dependence of intersubband lifetime and compare to the calculated dependence of electron- LO phonon scattering rates.

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Authors

  • Dmitry Smirnov

  • Aaron Wade

    • National High Magnetic Field Laboratory

  • Angela Vasanelli

  • Carlo Sirtori

    • Universite Paris VII, France