Q. Y. Lu, Y. Bai, N. Bandyopadhyay, S. Slivken, and M. Razeghi of the Center for Quantum Devices have published "Room-temperature continuous wave operation of distributed feedback quantum cascade lasers with watt-level power output" in APL 6 December 2010.
We demonstrate surface-grating distributed feedback quantum cascade lasers QCLs with a watt-level power output at 4.75 m. A device with a 5 mm cavity length exhibits an output power of 1.1 W in room-temperature cw operation. Single-mode operation with a side mode suppression ratio of 30 dB is obtained in the working temperature of 15– 105 ° C. A double-lobed far field with negligible beam steering is observed. The significance of this demonstration lies in its simplicity and readiness to be applied to standard QCL wafers with the promise of high-power performances.© 2010 American Institute of Physics. Read the full article
