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Related Experiment Videos

Modal interference and dynamical instability in a solid-state slice laser with asymmetric end-pumping.

Kenju Otsuka1, Jing-Yuan Ko, Tsong-Shin Lim

  • 1Department of Human and Information Science, Tokai University, 1117 Kitakaname, Hiratsuka, Kanagawa 259-1292, Japan.

Physical Review Letters
|August 23, 2002
PubMed
Summary
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Complex laser emission patterns were observed due to asymmetric pumping. Interference between nonorthogonal modes in the deformed cavity explains these instabilities, which were confirmed by numerical simulations.

Area of Science:

  • Laser Physics
  • Optics
  • Solid-State Physics

Background:

  • Fabry-Perot lasers are crucial optical resonators.
  • Asymmetric pumping can induce complex behaviors in laser systems.
  • Understanding transverse mode dynamics is key to laser stability.

Purpose of the Study:

  • To investigate complex emission patterns in a solid-state thin-slice Fabry-Perot laser.
  • To analyze the dependence of transverse patterns and intensity pulsations on pump power.
  • To elucidate the underlying physical mechanisms causing observed instabilities.

Main Methods:

  • Experimental observation of emission patterns in a solid-state thin-slice Fabry-Perot laser.
  • Systematic variation of pump power to study its effects.

Related Experiment Videos

  • Numerical simulations using model equations to reproduce experimental results.

    • Main Results:

    • Observed complicated emission patterns with multiple transverse modes.
    • Detected intensity pulsations at beat frequencies between transverse eigenmodes.
    • Demonstrated dependence of patterns and pulsation frequencies on pump power.
    • Interference among nonorthogonal transverse eigenmodes in a deformed cavity proposed as the cause of instabilities.

    Conclusions:

    • The interference of nonorthogonal transverse eigenmodes in an asymmetric, deformed microcavity explains the observed laser instabilities.
    • Numerical simulations successfully reproduced the complex intensity modulations.
    • Findings provide insight into controlling instabilities in asymmetric laser systems.