High-power CW mid-IR quantum cascade lasers

J. R. Meyer*, W. W. Bewley, J. R. Lindle, Vurgaftman, A. J. Evans, J. S. Yu, S. Slivken, M. Razeghi

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review


We report the cw operation of quantum cascade lasers that do not require cryogenic cooling and emit at λ, = 4.7-6.2 μm. At 200 K, more than 1 W of output power is obtained from 12-μm-wide stripes, with a wall-plug efficiency (η wall) near 10%. Room-temperature cw operation has also been demonstrated, with a maximum output power of 640 mW (η wall = 4.5%) at 6 μm and 260 mW (η wall = 2.3%) at 4.8 μm. Far-field characterization indicates that whereas the beam quality remains close to the diffraction limit in all of the tested lasers, in the devices emitting at 6.2 μm the beam tends to steer by as much as 5-10° in either direction with varying temperature and pump current.

Original languageEnglish (US)
Article number23
Pages (from-to)161-168
Number of pages8
JournalProgress in Biomedical Optics and Imaging - Proceedings of SPIE
StatePublished - 2005
EventQuantum Sensing and Nanophotonic Devices II - San Jose, CA, United States
Duration: Jan 23 2005Jan 27 2005


  • Diode laser
  • Mid-infrared
  • Quantum cascade laser
  • Quantum well

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Radiology Nuclear Medicine and imaging
  • Biomaterials


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