Short wavelength (λ ∼ 4.3 μm) high-performance continuous-wave quantum-cascade lasers

J. S. Yu*, A. Evans, S. Slivken, S. R. Darvish, M. Razeghi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

44 Scopus citations


We report continuous-wave (CW) operation of a 4.3-μm quantum-cascade laser from 80 K to 313 K. For a high-reflectivity-coated 11-/μm-wide and 4-mm-long laser, CW output powers of 1.34 W at 80 K and 26 mW at 313 K are achieved. At 298 K, the CW threshold current density of 1.5 kA/ cm2 is observed with a CW output power of 166 mW and maximum wall-plug efficiency of 1.47%. The CW emission wavelength varies from 4.15 μm at 80 K to 4.34 μm at 298 K, corresponding to a temperature-tuning rate of 0.87 nm/K. The beam full-width at half-maximum values for the parallel and the perpendicular far-field patterns are 26° and 49° in CW mode, respectively.

Original languageEnglish (US)
Pages (from-to)1154-1156
Number of pages3
JournalIEEE Photonics Technology Letters
Issue number6
StatePublished - Jun 2005


  • Continuous wave (CW)
  • High-power operation
  • Midinfrared
  • Quantum wells (QWs)
  • Quantum-cascade lasers (QCLs)

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering


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