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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 53, Iss. 17 — Jun. 10, 2014
  • pp: 3593–3597

Interferometric investigation of the influence of argon buffer gas on the characteristics of laser-induced aluminum plasmas

Seong Y. Oh, Jagdish P. Singh, and Changhwan Lim  »View Author Affiliations

Applied Optics, Vol. 53, Issue 17, pp. 3593-3597 (2014)

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An interferometric analysis was performed to investigate the influence of argon (Ar) buffer gas on the characteristics of laser-induced aluminum (Al) plasma at atmospheric pressure. The plasma was produced by focusing a Q -switched Nd:YAG laser pulse ( λ = 1064 nm , pulse duration 5 ns , E = 6.0 mJ ) onto an Al target. The interference patterns were constructed using a Nomarski interferometer incorporated with a frequency-doubled, Q -switched Nd:YAG laser ( λ = 532 nm , pulse duration 10 ns ) that generates an interferometric probe beam. The interferometric measurements were carried out as a function of the elapsed time after the onset of breakdown under the conditions of open air and an Ar gas jet flow ( 5 l / min ). With the injection of an Ar buffer gas jet in the ablation process, an increase in electron density and a preferential axial plasma expansion of the plasma plume were observed during the early stages of plasma formation as a consequence of increased inverse-Bremsstrahlung (IB) absorption efficiency.

© 2014 Optical Society of America

OCIS Codes
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(140.3440) Lasers and laser optics : Laser-induced breakdown
(280.5395) Remote sensing and sensors : Plasma diagnostics
(300.6365) Spectroscopy : Spectroscopy, laser induced breakdown
(110.2650) Imaging systems : Fringe analysis

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: March 4, 2014
Revised Manuscript: April 28, 2014
Manuscript Accepted: April 29, 2014
Published: June 2, 2014

Seong Y. Oh, Jagdish P. Singh, and Changhwan Lim, "Interferometric investigation of the influence of argon buffer gas on the characteristics of laser-induced aluminum plasmas," Appl. Opt. 53, 3593-3597 (2014)

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