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Proceedings Article

Laser sustained plasma ball lensing effect controlled by means of coaxial gas flow

[+] Author Affiliations
V. P. Zimakov, A. Y. Kedrov, V. A. Kuznetsov, A. N. Shemyakin, N. G. Solovyov, M. Y. Yakimov

A.Ishlinsky Institute for Problems in Mechanics (Russian Federation)

Proc. SPIE 7913, Laser Resonators and Beam Control XIII, 791305 (February 18, 2011); doi:10.1117/12.880761
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From Conference Volume 7913

  • Laser Resonators and Beam Control XIII
  • Alexis V. Kudryashov; Alan H. Paxton; Vladimir S. Ilchenko
  • San Francisco, California, USA | January 22, 2011

abstract

The results of laser beam refraction studies in a continuous optical discharge (COD) stabilized in a focused (f4.4) laser beam and coaxial gas flow are reported. A plasma ball formed in COD acts as a defocusing plasma lens where lensing effect occurs mainly due to distributed free electrons. The properties of the plasma lens depending on the electron density distribution and controlled through a gas flow velocity have being studied. Intensity profiles of sustaining laser beam (M2 = 6.6) transmitted through the plasma together with intensity patterns of visible plasma images were simultaneously detected and analyzed. It was found that the dependency of average refraction angle of the sustaining beam in COD plasma on a gas flow velocity drops sharply as the velocity increased 1.5 m/s from initial value of 0.06 radians to milliradians, so that at higher gas flow velocities the beam refraction does not affect plasma properties. A shape of the curve of the refraction on gas flow velocity reveals the peculiarities of lensing properties of the plasma ball. The possibility of controlling the lensing effect in plasma by means of the gas flow was also demonstrated.

© (2011) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Citation

V. P. Zimakov ; A. Y. Kedrov ; V. A. Kuznetsov ; A. N. Shemyakin ; N. G. Solovyov, et al.
"Laser sustained plasma ball lensing effect controlled by means of coaxial gas flow", Proc. SPIE 7913, Laser Resonators and Beam Control XIII, 791305 (February 18, 2011); doi:10.1117/12.880761; http://dx.doi.org/10.1117/12.880761


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