Quantenkaskadenlaser

EP 1536531 A UPAB: 20050818 NOVELTY - A quantum cascade laser has an emission wavelength below 3.4 mu m and above 1.5 mu m. The semiconductor multi-layer structure has a cup layer of indium gallium arsenide (InGaAs) and a barrier layer of aluminum arsenic antimonide (AlAsSb). The cup layer thickness is in the optically active range of 1 to 4 nm. USE - Quantum cascade laser. ADVANTAGE - The laser extends the range within which the quantum cascade laser may operate