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Related Experiment Video

Updated: Jul 16, 2026

Low-cost Custom Fabrication and Mode-locked Operation of an All-normal-dispersion Femtosecond Fiber Laser for Multiphoton Microscopy
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Photon statistics of semiconductor microcavity lasers.

S M Ulrich1, C Gies, S Ates

  • 1Institut für Strahlenphysik, Universität Stuttgart, Germany. s.ulrich@physik.uni-stuttgart.de

Physical Review Letters
|March 16, 2007
PubMed
Summary

We measured coherence in quantum-dot lasers, revealing a broad threshold and smooth transition from spontaneous to stimulated emission, especially in high-beta microcavities. These findings aid in understanding laser dynamics and semiconductor laser theory.

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Area of Science:

  • Semiconductor physics
  • Quantum optics
  • Laser technology

Background:

  • Quantum-dot micropillar lasers are crucial for advanced photonic applications.
  • Understanding laser emission dynamics, particularly the transition from spontaneous to stimulated emission, is key to device optimization.
  • High-beta microcavities present unique challenges in characterizing laser behavior.

Purpose of the Study:

  • To experimentally measure and theoretically model the first- and second-order coherence of quantum-dot micropillar lasers.
  • To investigate the emission characteristics and transition dynamics in high-beta microcavities.
  • To provide a microscopic theoretical framework for semiconductor lasers incorporating quantum dots.

Main Methods:

  • Experimental measurements of first- and second-order coherence.
  • Analysis of photon intensity fluctuations and coherence length.
  • Development of a microscopic semiconductor laser theory for quantum dots.

Main Results:

  • Observed a broad threshold region in high-beta microcavities.
  • Intensity jump accompanied by significant photon intensity fluctuations and coherence length changes.
  • Visualized a smooth transition from spontaneous to stimulated emission, becoming less distinct at high beta.
  • Theoretical results align well with experimental intensity traces and photon statistics.

Conclusions:

  • The transition from spontaneous to stimulated emission in quantum-dot lasers is smooth and influenced by cavity properties (beta factor).
  • Microscopic theory incorporating quantum dots accurately describes experimental observations.
  • Coherence measurements provide critical insights into laser dynamics, especially in challenging high-beta regimes.