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2008
Journal Article
Titel
Dispersive gain and loss in midinfrared quantum cascade laser
Alternative
Zerstreuender Gewinn und Verlust in Quantenkaskadenlasern für das mittlere Infrarot
Abstract
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.
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