Absorption of the laser radiation by the laser plasma with gas microjet targets
- Authors: Borisevichus D.A.1, Zabrodskii V.V.2, Kalmykov S.G.2, Sasin M.E.2, Seisyan R.P.2
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Affiliations:
- Peter the Great St. Petersburg Polytechnical University
- Ioffe Physical Technical Institute
- Issue: Vol 43, No 1 (2017)
- Pages: 67-70
- Section: Article
- URL: https://journals.rcsi.science/1063-7850/article/view/202425
- DOI: https://doi.org/10.1134/S1063785017010060
- ID: 202425
Cite item
Abstract
An upper limit of absorption of the laser radiation in the plasma produced in a gas jet Xe target with the average density of (3–6) × 1018 cm–3 and the effective diameter of 0.7 mm is found. It is equal to ≈50% and remains constant under any variation in this range of densities. This result contradicts both theoretical assessments that have predicted virtually complete absorption and results of earlier experiments with the laser spark in an unlimited stationary Xe gas with the same density, where the upper limit of absorption was close to 100%. An analysis shows that nonlinearity of absorption and plasma nonequilibrium lead to the reduction of the absorption coefficient that, along with the limited size of plasma, can explain the experimental results.
About the authors
D. A. Borisevichus
Peter the Great St. Petersburg Polytechnical University
Email: Serguei.Kalmykov@mail.ioffe.ru
Russian Federation, St. Petersburg, 194251
V. V. Zabrodskii
Ioffe Physical Technical Institute
Email: Serguei.Kalmykov@mail.ioffe.ru
Russian Federation, St. Petersburg, 194021
S. G. Kalmykov
Ioffe Physical Technical Institute
Author for correspondence.
Email: Serguei.Kalmykov@mail.ioffe.ru
Russian Federation, St. Petersburg, 194021
M. E. Sasin
Ioffe Physical Technical Institute
Email: Serguei.Kalmykov@mail.ioffe.ru
Russian Federation, St. Petersburg, 194021
R. P. Seisyan
Ioffe Physical Technical Institute
Email: Serguei.Kalmykov@mail.ioffe.ru
Russian Federation, St. Petersburg, 194021