We demonstrate quantum cascade lasers at an emitting wavelength of 4.6μm, which are capable of room temperature, high power continuous wave (cw) operation. Buried ridge geometry with a width of 9.8μm was utilized. A device with a 3mm cavity length that was epilayer-down bonded on a diamond submount exhibited a maximum output power of 1.3W at room temperature in cw operation. The maximum output power at 80K was measured to be 4W, with a wall plug efficiency of 27%.
Articles you may be interested inSurface-emitting terahertz quantum cascade lasers with continuous-wave power in the tens of milliwatt range Appl. Phys. Lett. Characterization and analysis of single-mode high-power continuous-wave quantum-cascade laser J. Appl. Phys. 98, 084508 (2005); 10.1063/1.2112170 Cavity-length effects of high-temperature high-power continuous-wave characteristics in quantum-cascade lasers Appl. Phys. Lett. 83, 5136 (2003); 10.1063/1.1634689High-power continuous-wave operation of a 6 μm quantum-cascade laser at room temperature
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