Dynamics and polarization effects in small-area vertical-cavity surface-emitting lasers in free-running mode and with time-delayed feedback

Markus Sondermann, Hans Bohnet, Michael Weinkath, Thorsten Ackemann

Research output: Contribution to journalConference articlepeer-review

1 Citation (Scopus)

Abstract

The polarization dynamics of vertical-cavity surface-emitting lasers operating close to threshold is investigated experimentally. For free-running devices a characterization of the dynamics is given for a scenario when two modes are excited at threshold due to a small net gain anisotropy. The polarization dynamics in this regime are found to be governed by the relaxation oscillations and to exhibit an anticorrelation of the two modes. The level of anticorrelation is strongly depending on the injection current. If isotropic feedback by a distant reflector is added, the dynamics are governed by the external cavity round-trip time scale and low frequency fluctuations are observed for both modes. These are shown to occur also for large net gain anisotropy, but without excitation of polarization degrees of freedom.

Original languageEnglish
Pages (from-to)92-102
Number of pages11
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume4942
DOIs
Publication statusPublished - 1 Dec 2002
EventVCSELs and Optical Interconnects - Brugge, Belgium
Duration: 30 Oct 20021 Nov 2002

Keywords

  • feedback
  • low frequency fluctuations
  • polarization dynamics
  • vertical-cavity surface-emitting lasers

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