The invention concerns a quantum cascade laser, comprising a substrate, a stack of layers, having a prismatic shape with substantially trapezoidal cross-section, comprising a lower surface arranged on the substrate, an upper surface and lateral surfaces, said stack forming a gain region and two walls...http://www.google.com/patents/US20040126912?utm_source=gb-gplus-sharePatent US20040126912 - Quantum cascade laser and method for making same
