Long-wavelength (λ∼10.5 μm) quantum cascade lasers based on a photon-assisted tunneling transition in strong magnetic field

Magnetic field studies on photon-assisted tunneling transition-based quantum cascade lasers are reported. Laser action at a wavelength of View the MathML sourcem is achieved by oscillator strength tuning. The characteristics of these lasers are a small threshold current at low temperature (1.1 kA/cm2), an optical power up to 160 mW at 80 K and a maximal operation temperature of 200 K. A strong magnetic field applied perpendicularly to the layers results in a threshold current of the laser which shows several minima and maxima under increasing magnetic field. In a parallel magnetic field, electroluminescence measurements show a strong decrease, a broadening and a blue-shift of the luminescence peak.