Quantum-dot micropillar lasers subject to coherent time-delayed optical feedback from a short external cavity

Steffen Holzinger, Christian Schneider, Sven Höfling, Xavier Porte, Stephan Reitzenstein

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

We investigate the mode-switching dynamics of an electrically driven bimodal quantum-dot micropillar laser when subject to delayed coherent optical feedback from a short external cavity. We experimentally characterize how the external cavity length, being on the same order than the microlaser’s coherence length, influences the spectral and dynamical properties of the micropillar laser. Moreover, we determine the relaxation oscillation frequency of the micropillar by superimposing optical pulse injection to a dc current. It is found that the optical pulse can be used to disturb the feedback-coupled laser within one roundtrip time in such a way that it reaches the same output power as if no feedback was present. Our results do not only expand the understanding of microlasers when subject to optical feedback from short external cavities, but pave the way towards tailoring the properties of this key nanophotonic system for studies in the quantum regime of self-feedback and its implementation to integrated photonic circuits.
Original languageEnglish
Article number631
Number of pages8
JournalScientific Reports
Volume9
DOIs
Publication statusPublished - 24 Jan 2019

Keywords

  • Nanophotonics and plasmonics
  • Photonic devices
  • Quantum dots
  • Semiconductor lasers

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