Self-consistent theory of the gain linewidth for quantum-cascade lasers

F Banit, SC Lee, A Knorr, Andreas Wacker

Research output: Contribution to journalArticlepeer-review

78 Citations (SciVal)


The linewidth in intersubband transitions can be significantly reduced below the sum of the lifetime broadening for the involved states, if the scattering environment is similar for both states. This is studied within a nonequilibrium Green function approach here. We find that the effect is of particular relevance for a recent, relatively low doped, Terahertz quantum-cascade laser.
Original languageEnglish
Pages (from-to)41108-1-41108-3
JournalApplied Physics Letters
Issue number4
Publication statusPublished - 2005

Subject classification (UKÄ)

  • Condensed Matter Physics


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