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Method for determining antiphase dynamics in a multimode laser

Hill1, Stamatescu, Hamilton

  • 1Department of Physics and Mathematical Physics, University of Adelaide, Australia. thill@physics.adelaide.edu.au

Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics
|October 14, 2000
PubMed
Summary

We measured intensity fluctuations in a neodymium-doped yttrium aluminum garnet laser. The study reveals antiphase dynamics between longitudinal laser modes, showing how their fluctuations interfere.

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Area of Science:

  • Laser Physics
  • Quantum Optics
  • Nonlinear Dynamics

Background:

  • Multilongitudinal mode lasers are crucial for various applications.
  • Understanding mode interactions is key to controlling laser output.
  • Neodymium-doped yttrium aluminum garnet (Nd:YAG) lasers are widely used.

Purpose of the Study:

  • To investigate the cross-spectrum of intensity fluctuations for mode pairs in a Nd:YAG laser.
  • To elucidate the interference patterns and dynamics of longitudinal mode fluctuations.
  • To directly demonstrate the antiphase dynamics of intensity fluctuations.

Main Methods:

  • Measurement of the cross spectrum of intensity fluctuations.
  • Analysis of mode pairs in a multilongitudinal mode Nd:YAG laser.

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  • Operation in the steady-state regime.

    • Main Results:

    • The cross-spectrum analysis revealed distinct interference patterns between longitudinal modes.
    • Direct evidence of antiphase dynamics in the intensity fluctuations was observed.
    • The study mapped the interplay of fluctuations across different modes.

    Conclusions:

    • Longitudinal mode fluctuations in Nd:YAG lasers exhibit complex interference.
    • Antiphase dynamics are a fundamental characteristic of these laser systems.
    • The findings provide insights into controlling and optimizing multilongitudinal mode laser output.