Saturation and self-lensing in self-assembled quantum dots with constant-wave driving

A. Tierno, T. Ackemann, T. Maggipinto, M.G. Brambilla

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The nonlinear optical response of self-assembled quantum dots to cw driving is analyzed via numerical simulations of a spatially resolved rate equation model. The saturation is shown to follow a behavior in between the one for a dominantly, homogeneously, and inhomogeneously broadened medium. Self-lensing is suggested to probe the refractive-index nonlinearities and to open a complementary way of characterizing phase-amplitude coupling (alpha factor) in quantum-dots samples. For conservative assumptions on current samples the minimum focal length is predicted to be +/-1.7 mm for an input beam with 15 mu m radius at a detuning of 1.1 inhomogeneous linewidths from gain center.
Original languageEnglish
Article number035314
Number of pages6
JournalPhysical Review B
Volume80
Issue number3
DOIs
Publication statusPublished - Jul 2009

Keywords

  • linewidth enhancement factor
  • semiconductor optical amplifiers
  • differential efficiency
  • feedback solitons
  • gain saturation
  • cavity solitons
  • lasers
  • beam
  • filamentation
  • pattern

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