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Intersubband staircase laser

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5 Author(s)
Ulbrich, Nicolaus ; Walter Schottky Institut, Technische Universitat München, Am Coulombwall 3, D-85748 Garching, Germany ; Scarpa, Giuseppe ; Bohm, G. ; Abstreiter, G.
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A quantum-cascade laser is presented in which the injection minibands are omitted. The intersubband laser operates as a four-level staircase and has potential for higher gain devices due to an increased confinement factor compared to conventional quantum-cascade lasers. A high threshold current density of 5.9 kA/cm2 with peak output powers of 230 mW at 77 K is observed. A large wavelength shift from 9.3 to 10 μm and broadband emission are observed at higher bias fields. This modification to existing quantum-cascade laser designs has potential for higher gain devices, but problems with thermal backfilling and doping limit the operating temperature currently to 200 K. © 2002 American Institute of Physics.

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Applied Physics Letters  (Volume:80 ,  Issue: 23 )