Room-temperature continuous wave operation of distributed feedback quantum cascade lasers with watt-level power output

Q. Y. Lu, Y. Bai, N. Bandyopadhyay, S. Slivken, M. Razeghi

Research output: Contribution to journalArticlepeer-review

49 Scopus citations

Abstract

We demonstrate surface-grating distributed feedback quantum cascade lasers (QCLs) with a watt-level power output at 4.75 μm. 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.

Original languageEnglish (US)
Article number231119
JournalApplied Physics Letters
Volume97
Issue number23
DOIs
StatePublished - Dec 6 2010

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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