Relaxation kinetics in mid-infrared quantum cascade lasers

S. Slivken*, V. I. Litvinov, M. Razeghi, J. R. Meyer

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Non-equilibrium coupled electron-phonon system in active region of the quantum cascade intersubband laser is investigated. Distribution functions and gain spectra of a three-subband double-quantum-well active region are obtained as a function of temperature and injection current. The important role of the non-equilibrium phonons at losing threshold is shown and discussed in details. It is shown that the threshold current is strongly dependent of the power dissipated in the active region in steady state. The numerical calculations for an 8.5-μm laser illustrate the general issues of relaxation kinetics in quantum cascade lasers. Temperature dependence of the threshold current is obtained in a good agreement with the experiment. We also present the results of fabrication of high-T0 quantum cascade lasers operating in 5- and 8-μm bands.

Original languageEnglish (US)
Pages (from-to)207-216
Number of pages10
JournalOpto-electronics Review
Issue number3
StatePublished - 1998

ASJC Scopus subject areas

  • Radiation
  • Materials Science(all)
  • Electrical and Electronic Engineering


Dive into the research topics of 'Relaxation kinetics in mid-infrared quantum cascade lasers'. Together they form a unique fingerprint.

Cite this