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Updated: Jun 13, 2026

Non-equilibrium Microwave Plasma for Efficient High Temperature Chemistry
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Refractive Q-switching of a ruby laser by a moving plasma.

M Dembinski1, P K John

  • 1University of Western Ontario, Physics Department, London, Ontario N6A 3K7.

Applied Optics
|April 17, 2010
PubMed
Summary

Plasma generated in a shock tube was used to Q-switch a ruby laser. This novel method resulted in measurable laser beam refraction and improved laser cavity alignment.

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Area of Science:

  • Physics
  • Laser Technology
  • Plasma Physics

Background:

  • Q-switching is a technique for achieving high-intensity laser pulses.
  • Controlling plasma density and gradients is crucial for optical applications.

Purpose of the Study:

  • To investigate the use of plasma as a Q-switching medium for a ruby laser.
  • To analyze the optical effects of plasma within a laser cavity.

Main Methods:

  • A ruby laser system was employed.
  • Plasma was generated using an electromagnetic shock tube with densities up to 10^18 cm^-3.
  • The effect of plasma on laser beam refraction and cavity alignment was measured.

Main Results:

  • The plasma successfully Q-switched the ruby laser.
  • A significant density gradient from reflected plasma caused measurable laser beam refraction.
  • Introduction of plasma into the cavity led to automatic alignment of the initially misaligned laser.

Conclusions:

  • Plasma is a viable medium for Q-switching lasers.
  • Plasma dynamics can be harnessed for laser beam manipulation and cavity stabilization.

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