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Synchronization of mutually coupled self-mixing modulated lasers

Otsuka1, Kawai, Hwong

  • 1Department of Applied Physics, Tokai University, 1117 Kitakaname, Hiratsuka, Kanagawa 259-1292 Japan.

Physical Review Letters
|October 6, 2000
PubMed
Summary

Researchers achieved synchronized chaos in coupled LiNdP4O12 lasers using feedback modulation. Increased coupling led to an abrupt transition to synchronized chaos via "phase squeezing," confirmed by numerical models.

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Area of Science:

  • Nonlinear Optics
  • Laser Physics
  • Chaos Theory

Background:

  • Mutual synchronization of chaotic lasers is a complex phenomenon.
  • Microchip lasers offer compact and efficient platforms for studying laser dynamics.

Purpose of the Study:

  • To demonstrate and investigate the synchronization of mutually coupled chaotic lasers.
  • To explore the transition mechanism to synchronized chaos in a LiNdP4O12 laser array.

Main Methods:

  • Utilized a microchip LiNdP4O12 laser array with self-mixing feedback modulation.
  • Varied the coupling strength between the two lasers.
  • Employed numerical calculations using established model equations for validation.

Main Results:

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  • Successfully demonstrated synchronization of mutually coupled chaotic lasers.
  • Observed an abrupt transition to synchronized chaos through a phenomenon termed "phase squeezing" as coupling increased.
  • Numerical simulations accurately reproduced the experimental observations.
  • Synchronized chaos exhibited concurrent low energy variation and high disorder.

Conclusions:

  • The study confirms the feasibility of achieving synchronized chaos in coupled LiNdP4O12 lasers.
  • "Phase squeezing" is identified as a key mechanism driving the transition to synchronized chaos.
  • The findings are supported by robust numerical modeling, validating the observed dynamics.