Birefringence controlled room-temperature picosecond spin dynamics close to the threshold of vertical-cavity surface-emitting laser devices

M. Y. Li, H Jahme, H. Soldat, N. C. Gerhardt, M. R. Hofmann, T. Ackemann

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Abstract

We analyze the spin-induced circular polarization dynamics at the threshold of vertical-cavity surface-emitting lasers at room-temperature using a hybrid excitation combining electrically pumping without spin preference and spin-polarized optical injection. After a short pulse of spin-polarized excitation, fast oscillations of the circular polarization degree (CPD) are observed within the relaxation oscillations. A theoretical investigation of this behavior on the basis of a rate equation model shows that these fast oscillations of CPD could be suppressed by means of a reduction of the birefringence of the laser cavity.

Original languageEnglish
Article number19191114
Number of pages3
JournalApplied Physics Letters
Volume97
Issue number19
DOIs
Publication statusPublished - 8 Nov 2010

Keywords

  • polarization-dynamics
  • semiconductor-lasers
  • injection
  • fluctuations
  • noise
  • mode

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