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Oscillations In An LC Circuit01:30

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Construction and Characterization of External Cavity Diode Lasers for Atomic Physics
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Phase synchronization in mutually coupled chaotic diode lasers.

Y Aviad1, I Reidler, W Kinzel

  • 1Jack and Pearl Resnick Institute for Advanced Technology, Department of Physics, Bar-Ilan University, Ramat-Gan 52900, Israel.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|October 15, 2008
PubMed
Summary
This summary is machine-generated.

Optical feedback in semiconductor lasers causes chaotic pulsations. When coupled, these lasers synchronize not just in amplitude and timing, but also in phase coherence, even over long distances.

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Area of Science:

  • Physics
  • Optics
  • Laser Technology

Background:

  • Semiconductor lasers with optical feedback exhibit chaotic pulsating output.
  • Optical coupling of similar chaotic lasers can lead to synchronization of their fluctuations.

Purpose of the Study:

  • To investigate the nature of synchronization in optically coupled chaotic semiconductor lasers.
  • To determine if synchronization extends beyond amplitude and timing to include phase coherence.

Main Methods:

  • Utilized two similar chaotic semiconductor lasers subjected to optical coupling.
  • Analyzed the output fluctuations, focusing on amplitude, timing, and phase relationships.

Main Results:

  • Synchronization was observed in both the amplitude and timing of the chaotic pulsations.
  • Crucially, the short laser pulses demonstrated phase coherence with each other.
  • This phase coherence persisted even when the lasers were separated by distances exceeding their coherence length.

Conclusions:

  • Optically coupled chaotic semiconductor lasers achieve a high degree of synchronization, including phase coherence.
  • The findings reveal a deeper level of synchronization than previously understood, with implications for laser dynamics and applications.