High-Power High-Temperature Continuous-Wave Operation of Quantum Cascade Laser at &lgr;∼4.6 &mgr;m without Lateral Regrowth.

High-power quantum cascade lasers (&lgr; = 4.6 &mgr;m) working in continuous wave (cw) up to 90°C are presented. The material was grown by solid-source molecular beam epitaxy and processed into narrow conventional ridge geometry without lateral regrowth. High cw output power of 850mW at 10°C and more than 200mW at 90°C were obtained with threshold current densities of 1.34 and 2.47 kA/cm2, respectively, for a high-reflectivity-coated 12-&mgr;m-wide and 3-mm-long laser. [ABSTRACT FROM AUTHOR]