Thermal and stark-effect roll-over of quantum-cascade lasers

Scott S. Howard, Zhijun Liu, Claire F. Gmachl

Research output: Contribution to journalArticlepeer-review

38 Scopus citations


A computational and experimental analysis of rollover in high-performance lambda λ ∼ 8μm quantum-cascade (QC) lasers is presented. In addition to conventional, thermal rollover, which is also a common cause of power rollover in diode lasers, "Stark-effect" rollover is observed. While both effects can occur in the same QC laser design, thermal and Stark-effect rollover are shown to be the dominating factor for high-temperature continuous wave operated, and pulsed low-temperature operated and low-doped lasers, respectively. Additionally, the role of the continuum above the wells and barriers is discussed for both effects.

Original languageEnglish (US)
Pages (from-to)319-323
Number of pages5
JournalIEEE Journal of Quantum Electronics
Issue number4
StatePublished - 2008

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


  • Quantum-cascade (QC) laser
  • Rollover
  • Thermal modeling


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