Single-focusing regime of propagation of femtosecond light packets when self-focused in a condensed medium |
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Authors: | Yu M Mikhailova V T Platonenko and J Zheng |
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Institution: | (1) Faculty of Physics and International Laser Center, Moscow State University, Moscow, 119992, Russia;(2) Prokhorov Institute of General Physics, Russian Academy of Sciences, ul. Vavilova 38, Moscow, 119991, Russia;(3) Research Center of Laser Fusion, CAEP, Mianyang, 621900, China |
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Abstract: | Numerical simulations are used to investigate the propagation of tightly focused megawatt femtosecond light packets in a nonlinear condensed medium in the single-focusing regime. A plasma is shown to be generated in a small region whose length and diameter increase with power in the single-focusing regime of propagation of a femtosecond light packet in a transparent dielectric. The limiting electron density in the microplasma formation region is virtually independent of the laser pulse power but increases with numerical aperture of the focusing optics. At a fixed femtosecond pulse power exceeding the critical self-focusing power, the transmission of light by a dielectric layer decreases with increasing numerical aperture of the focusing optics. |
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