• M. V. Maximov
  • Yu. M. Shernyakov
  • G. O. Kornyshov
  • A. A. Beckman
  • F. I. Zubov
  • A. A. Kharchenko
  • A. S. Payusov
  • S. A. Mintairov
  • N. A. Kalyuzhnyy
  • V. G. Dubrovskii
  • N. Yu. Gordeev
We study the current-controlled lasing switching from the ground state (GS) to the excited state (ES) transition in broad-area (stripe width 100 µm) InGaAs/GaAs quantum well-dot (QWD) and quantum well (QW) lasers. In the lasers with one QWD layer and a 0.45 µm-thick GaAs waveguide, pure GS lasing takes place up to an injection current as high as 8 A (40 kA/cm 2 ). In contrast, in QW lasers with a similar design, ES lasing emerges already at 3 A (15 kA/cm 2 ). The ES lasing in the QWD lasers is observed only in the devices with a waveguide thickness of 0.78 µm that supports a 2nd order transverse mode at the wavelength of the ES transition. Increasing the modal gain in the lasers with 0.78 µm-thick waveguide by using two QWD layers in the active region suppresses the ES lasing.
Original languageEnglish
Article number6213
JournalOptics Letters
Volume49
Issue number21
DOIs
StatePublished - 28 Oct 2024

ID: 127402175