Journal
PHYSICAL REVIEW LETTERS
Volume 84, Issue 11, Pages 2405-2408Publisher
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.84.2405
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A laser self-focused channel formation into overdense plasmas was observed using a soft x-ray laser probe system with a grid image refractometry (GIR) technique. 1.053 mu m laser light with a 100 ps pulse duration was focused onto a preformed plasma at an intensity of 2 X 10(17) W/cm(2). Cross sections of the channel were obtained which show a 30 mu m diameter in overdense plasmas. The channel width in the overdense region was kept narrow as a result of self-focusing. Conically diverging density ridges were also observed along the channel, indicating a Mach cone created by a shock wave due to the supersonic propagation of the channel front.
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