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Electrically switchable, two-color quantum cascade laser emitting at 1.39 and 2.3 THz

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5 Author(s)
Scalari, G. ; Institute of Physics, University of Neuchâtel, CH-2000 Neuchâtel, Switzerland ; Walther, Christoph ; Faist, Jerome ; Beere, Harvey
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A quantum cascade laser emitting at 1.39 and 2.3 THz is demonstrated. The structure is based on a large single quantum well and multiwavelength operation is obtained by selectively injecting carriers by resonant tunneling in the excited states of the well. A magnetic field applied perpendicularly to the layers increases the gain enabling laser action. Extremely low values of the threshold current density (below 30 A/cm2) are observed for both wavelengths. A study of the dependence of the laser emission intensity as a function of the applied magnetic field is also presented.

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Applied Physics Letters  (Volume:88 ,  Issue: 14 )