Ridge-Width Dependence on High-Temperature Continuous-Wave Quantum-Cascade Laser Operation

S. Slivken*, J. S. Yu, A. Evans, J. David, L. Doris, M. Razeghi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

47 Scopus citations


We report continuous-wave (CW) operation of quantum-cascade lasers (λ = 6 μm) up to a temperature of 313 K (40°C). The maximum CW optical output powers range from 212 mW at 288 K to 22 mW at 313 K and are achieved with threshold current densities of 2.21 and 3.11 kA/cm2, respectively, for a high-reflectivity-coated 12-μm-wide and 2-mm-long laser. At room temperature (298 K), the power output is 145 mW at 0.87 A, corresponding to a power conversion efficiency of 1.68%. The maximum CW operating temperature of double-channel ridge waveguide lasers mounted epilayer-up on copper heatsinks is analyzed in terms of the ridge width, which is varied between 12 and 40 μm. A clear trend of improved performance is observed as the ridge narrows.

Original languageEnglish (US)
Pages (from-to)744-746
Number of pages3
JournalIEEE Photonics Technology Letters
Issue number3
StatePublished - Mar 2004


  • Continuous-wave (CW) lasers
  • Infrared measurements
  • Quantum cascade lasers (QCLs)
  • Quantum-well lasers

ASJC Scopus subject areas

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


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