Modeling of laser ponderomotive self-focusing in plasma within the paraxial complex geometrical optics approach

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F19%3A00521625" target="_blank" >RIV/68378271:_____/19:00521625 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1088/1361-6587/ab467b" target="_blank" >https://doi.org/10.1088/1361-6587/ab467b</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1088/1361-6587/ab467b" target="_blank" >10.1088/1361-6587/ab467b</a>

Result language
angličtina
Original language name
Modeling of laser ponderomotive self-focusing in plasma within the paraxial complex geometrical optics approach
Original language description
Laser ponderomotive self-focusing in an underdense homogeneous plasma is studied within the paraxial complex geometrical optics (PCGO) approach implemented in a hydrodynamic code in two-dimensional planar geometry. The self-focusing of a PCGO Gaussian beam is compared to simulations performed with a paraxial electromagnetic code. Good agreement has been found for beam powers less than three times the critical power and for plasma densities 5%-10% of the critical density. Besides Gaussian beams, PCGO allows to reproduce spatially modulated beams by superposition of Gaussian beams, mimicking a speckle pattern. Although the statistics of speckle patterns generated with PCGO reproduces well the speckle statistics of optically smoothed beams, a PCGO speckle is larger than optical speckles, carrying thus higher power such that they overestimate self-focusing effects. To overcome this issue, an algorithm is proposed within PCGO framework: it consists of superposing several Gaussian beams forming a speckle such that self-focusing effects are eventually well controlled. It is found that the superposition of three Gaussian beams with appropriate initial conditions leads to a reduction of the PCGO speckle intensity enhancement.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10305 - Fluids and plasma physics (including surface physics)

Project
<a href="/en/project/EF16_013%2F0001793" target="_blank" >EF16_013/0001793: Extreme Light Infrastructure Tools for Advanced Simulation</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2019
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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