High-power quantum cascade lasers grown by low-pressure metal organic vapor-phase epitaxy operating in continuous wave above 400K

High-power quantum cascade lasers (QCLs) working in continuous wave (cw) above $400\mathrm{K}$ are presented. The material was grown by low-pressure metal organic vapor-phase epitaxy and processed into narrow buried heterostructure lasers. A cw output power of $204\mathrm{mW}$ was obtained at $300\mathrm{K}$ with an $8.38\mu \mathrm{m}$ wavelength, $3\mathrm{mm}$ long and $7.5\mu \mathrm{m}$ wide coated laser. The device operates in cw mode above $400\mathrm{K}$ , which exceeds the previous maximum cw temperature operation of QCLs by approximately $60\mathrm{K}$ . Preliminary reliability data obtained by accelerated aging tests indicate a remarkable robustness of the lasers.