Analysis of laser radiation transmitted through a plasma as a method for estimating the internal parameters of the laser-produced plasma
Butorin P. S.
1, Belashov A. V.1, Kalmykov S. G.
1, Sasin M. E.1, Serdobintsev P. Yu.2,3
1Ioffe Institute, St. Petersburg, Russia
2Peter the Great Saint-Petersburg Polytechnic University, St. Petersburg, Russia
3St. Petersburg State University, St. Petersburg, Russia
Email: Butorin_ps@mail.ru, serguei.kalmykov@mail.ioffe.ru, sasin@ffm.ioffe.ru, serdobintsev@rambler.ru
A technique is described that makes it possible to obtain the distribution of the absorbed energy of a laser pulse over the cross section of the laser-produced plasma. The infrared laser radiation that creates the plasma at the same time plays the role of radiation that probes it. The pattern of the absorbed energy distribution over the beam section is increased to macroscopic dimensions, that allows to study it using standard methods. As a result, spatial resolution within the plasma location of several units/tens of microns has been attained. The data on the distribution of the laser energy absorbed part over the plasma cross section give an idea about the characteristic features of the distribution of the plasma temperature. Keywords: laser spark, laser, radiation absorption, laser plasma parameters, infrared radiation.
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