Summary form only given. Quantum cascade (QC) lasers are fundamentally new semiconductor light sources in two respects. Their wavelength is not determined by the band gap of the material and can be tailored over a wide range of the mid-infrared region (3.4 /spl mu/m to 17 /spl mu/m) using the same combination of materials by a suitable choice of the active layer thicknesses. This tutorial will emphasize the underlying physics, design principles and performance of QC lasers based on intersubband transitions. Recent results on high-resolution spectroscopy will be presented and applications to chemical sensors for trace gas analysis with part per billion sensitivities.
Quantum cascade lasers
01.01.1999
148648 byte
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
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