Room-temperature continuous-wave quantum cascade lasers grown by MOCVD without lateral regrowth

Zhijun Liu, Daniel Wasserman, Scott S. Howard, Anthony J. Hoffman, Claire F. Gmachl, Xiaojun Wang, Tawee Tanbun-Ek, Liwei Cheng, Fow Sen Choa

Research output: Contribution to journalArticlepeer-review

121 Scopus citations


We report on room-temperature continuous-wave (CW) operation of λ ∼ 8.2 μm quantum cascade lasers grown by metal-organic chemical vapor deposition without lateral re-growth. The lasers have been processed as double-channel ridge waveguides with thick electroplated gold. CW output power of 5.3 mW is measured at 300 K with a threshold current density of 2.63 kA/cm2. The measured gain at room temperature is close to the theoretical design, which enables the lasers to overcome the relatively high waveguide loss.

Original languageEnglish (US)
Pages (from-to)1347-1349
Number of pages3
JournalIEEE Photonics Technology Letters
Issue number12
StatePublished - Jun 15 2006
Externally publishedYes

All Science Journal Classification (ASJC) codes

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


  • Continuous-wave (CW) lasers
  • Midinfrared
  • Quantum cascade (QC) lasers
  • Semiconductor lasers


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