Abstract
The emitted wavelength of quantum cascade (QC) lasers is essentially determined by quantum confinement as these devices are based on intersubband transitions.1 The wavelength is usually designed by thickness modelling of the different lattice matched layers within the active region. By changing the indium composition one can further increase the energy difference between the intersubband states and thus reach wavelengths below 5µm2 at the cost of introducing strain into the structure. In such structures the overall stress of a period should be zero and each strained layer must not exceed the critical layer thickness to remain in a two-dimensional growth mode without strain relaxation and dislocation generation.
© 2001 Optical Society of America
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