Nonlinear gain behavior in injectorless quantum cascade lasers

Simeon Katz, Augustinas Vizbaras, Gerhard Boehm, Markus Christian Amann

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


The gain spectra of a continuous wave operating injectorless quantum cascade lasers are presented. These are extracted by the Hakki-Paoli method from electroluminescence measurements. The device operates around 7.4 m and has threshold current densities in pulsed and continuous wave operation at room temperature that measure 1.1 and 1.76 kA/cm2, respectively. The differential gain coefficients around 100 cm/kA at liquid nitrogen temperature and 44 cm/kA around room temperature are determined. The gain measurement values are compared with the 1/L threshold behavior versus temperature, indicating a nonlinear gain current dependence of injectorless devices.

Original languageEnglish
Article number111107
JournalOptical Engineering
Issue number11
StatePublished - Nov 2010


  • Gain measurement
  • Injectorless
  • Nonlinear gain
  • Quantum cascade laser


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