High-Power Continuous-Wave Operation of Quantum-Cascade Lasers up to 60°C

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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

58 Scopus citations


High-temperature high-power continuous-wave (CW) operation of high-reflectivity-coated 12-μm-wide quantum-cascade lasers emitting at λ = 6 μm with a thick electroplated Au top contact layer is reported for different cavity lengths. For a 3-mm-long laser, the CW optical output powers of 381 m W at 293 K and 22 mW at maximum operating temperature of 333 K (60°C) are achieved with threshold current densities of 1.93 and 3.09 kA/cm2, respectively. At 298 K, the same cavity gives a maximum wall plug efficiency of 3.17% at 1.07 A. An even higher CW optical output power of 424 mW at 293 K is obtained for a 4-mm-long laser and the device also operates up to 332 K with an output power of 14 mW. Thermal resistance is also analyzed at threshold as a function of cavity length.

Original languageEnglish (US)
Pages (from-to)747-749
Number of pages3
JournalIEEE Photonics Technology Letters
Issue number3
StatePublished - Mar 2004


  • Cavity length
  • Continuous wave (CW)
  • High-temperature operation
  • Mid-infrared
  • Quantum wells
  • 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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