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Dispersive gain and loss in midinfrared quantum cascade laser

Zerstreuender Gewinn und Verlust in Quantenkaskadenlasern für das mittlere Infrarot
: Revin, D.G.; Soulby, M.R.; Cockburn, J.W.; Yang, Q.K.; Manz, C.; Wagner, J.


Applied Physics Letters 92 (2008), No.8, Art. 081110, 3 pp.
ISSN: 0003-6951
ISSN: 1077-3118
Journal Article
Fraunhofer IAF ()
gain; Gewinn; loss; Verlust; dispersive gain/loss; dispersiver Gewinn/Verlust; mid-infrared; mittleres Infrarot; quantum cascade laser; Quantenkaskadenlaser; InGaAs/AlAsSb

We report the measurements of dispersive gain (simultaneous coexistence of gain and losses on a single intersubband transition) in a quantum cascade laser. Broadband transmission spectra through the waveguide of a Lambda ~4.7 µm In0.53Ga0.47As/AlAs0.56Sb0.44/InP quantum cascade laser have been studied at a bias below laser threshold and at different temperatures. For a certain range of current, and at temperatures higher than about 150 K, the transmission spectra show clear dispersive gain/loss behavior with the possibility for intersubband gain to be observed even without global population inversion between laser levels.