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Title: Self-focusing and frequency broadening of laser pulse in water

An analytical model for the avalanche breakdown of water by an intense short laser pulse of finite spot size is developed. Initially, the laser undergoes self-focusing due to Kerr nonlinearity. As it acquires large intensity, it causes heating and avalanche breakdown of water. The plasma thus created on the laser axis causes nonlinear refraction induced defocusing of the laser. Thermal conduction tends to flatten the temperature profile and reduce the nonlinear refraction. The plasma density modification leads to frequency broadening of the laser.
Authors:
;  [1] ;  [2]
  1. Department of Physics, Indian Institute of Technology Delhi, New Delhi 110016 (India)
  2. Princeton Plasma Physics Laboratory, Princeton, New Jersey 08540 (United States)
Publication Date:
OSTI Identifier:
22403250
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 21; Journal Issue: 11; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; FOCUSING; LASERS; NONLINEAR PROBLEMS; PLASMA DENSITY; PULSES; THERMAL CONDUCTION; WATER