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Chinese Optics Letters

Chinese Optics Letters

| PUBLISHED MONTHLY BY CHINESE LASER PRESS AND DISTRIBUTED BY OSA

  • Vol. 3, Iss. S1 — Aug. 28, 2005
  • pp: S100–S102

Numerical simulation for laser-induced breakdown thresholds and plasma formation in water

Hongchao Zhang, Jian Lu, Xiaowu Ni, and Zhonghua Shen  »View Author Affiliations


Chinese Optics Letters, Vol. 3, Issue S1, pp. S100-S102 (2005)


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Abstract

Two models to calculate the irradiance threshold for laser-induced breakdown for water have been introduced. Both of the models have been incorporated into a computer code and code results compared to experimentally measured irradiance threshold for breakdown of pure water by nanosecond, picosecond and femtosecond laser pulses in the visible and near-infrared. The result shows that the second one has a wider range than first one to agree with the experiment data. For nanosecond laser pulses, the generation of free electrons in distilled water is initiated by multiphoton ionization but then dominated by cascade ionization. For shorter laser pulses, multiphoton ionization gains ever more importance, and collision and recombination losses during breakdown diminish. The threshold near infrared is more depend on the initial electrons.

© 2005 Chinese Optics Letters

OCIS Codes
(140.0140) Lasers and laser optics : Lasers and laser optics
(140.3440) Lasers and laser optics : Laser-induced breakdown
(260.5210) Physical optics : Photoionization
(350.5400) Other areas of optics : Plasmas

Citation
Hongchao Zhang, Jian Lu, Xiaowu Ni, and Zhonghua Shen, "Numerical simulation for laser-induced breakdown thresholds and plasma formation in water," Chin. Opt. Lett. 3, S100-S102 (2005)
http://www.opticsinfobase.org/col/abstract.cfm?URI=col-3-S1-S100


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