期刊
JOURNAL OF PHYSICS COMMUNICATIONS
卷 7, 期 3, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/2399-6528/acbf05
关键词
lasers; laguerre-gaussian; self-focusing; self-compression; plasma; nonlinear
Simultaneous self-focusing and compression of ultrashort weakly-relativistic Laguerre-Gaussian laser pulses in dense plasma is studied. A theoretical model is developed and particle-in-cell simulations are conducted to examine the physics in detail. Rapid self-focusing and compression are observed, followed by the formation of post-soliton structures and filamentation. Burst of MeV electrons are also observed at points of collapse.
Simultaneous self-focusing and compression of ultrashort weakly-relativistic Laguerre-Gaussian laser pulses in dense plasma is investigated theoretically and numerically. A simple theoretical model is developed and used to identify parameter regimes of interest, and then three-dimensional particle-in-cell simulations are carried out to examine the physics in detail. Rapid self-focusing and compression are observed, leading to pulse collapse even for laser pulse energy at the ten millijoule level. Long-lived ring-shaped post-soliton structures are left at the location of the first collapse, and the residual laser energy is scattered into the plasma. Filamentation and re-focusing occur beyond this point, the structure of which depends on the beam parameters but is observed to be only weakly dependent upon the mode of the laser. Circularly-polarised light is found to produce particulary symmetric plasma density structures. In all cases, bursts of MeV electrons with thermal-like spectra are observed at points of collapse.
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