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Dynamical Buildup of Lasing in Mesoscale Devices.

T Wang1,2, G P Puccioni3, G L Lippi1,2

  • 1Institut Non Linéaire de Nice, Université de Nice-Sophia Antipolis.

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|October 30, 2015
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Summary

New physics governs laser field buildup in Class B lasers, moving beyond classical photon statistics. Dynamical spikes control the transition, offering insights into nanolaser operation and applications.

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Area of Science:

  • Optics and Photonics
  • Quantum Optics
  • Laser Physics

Background:

  • Classical laser theory describes field buildup using time-averaged photon statistics.
  • Class A lasers are understood as a mixture of coherent and incoherent photons.
  • Inconsistencies in small-scale laser behavior suggest limitations of current models.

Purpose of the Study:

  • To investigate the physics of laser field buildup in the threshold region of Class B mesoscale lasers.
  • To identify the mechanisms controlling the transition from spontaneous emission to coherent lasing.
  • To explain previously observed anomalies in small-scale laser devices.

Main Methods:

  • Acquisition of temporal data streams from a Class B mesoscale laser near threshold.
  • Application of multiple advanced analysis techniques to the acquired data.
  • Characterization of photon statistics and dynamical behavior during lasing transition.

Main Results:

  • Lasing buildup is dominated by large dynamical spikes, not just a statistical photon mixture.
  • The number of these spikes increases with pump power.
  • The field evolves from spikes to a coherent state modulated by population dynamics, then to a steady state.

Conclusions:

  • The transition to lasing in Class B lasers involves new physics beyond classical descriptions.
  • Dynamical spikes are crucial for understanding laser coherence and threshold behavior.
  • Findings have implications for nanolaser design, operation, and potential applications.