Ionization assisted self-guiding of femtosecond laser pulses
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© 2018 Author(s). We propose a new mechanism for the self-guiding of ultra-intense sub-picosecond laser pulses in gaseous media. It can be realized via optical field ionization by a laser pulse as it propagates inside an expanding cylindrical shock wave launched into ambient gas by a decayed plasma filament. In experiments, the filament was created in a hydrogen jet by a low energy femtosecond laser pre-pulse line focused with axicon lens. We demonstrated ionization-assisted guiding in structures with diameter as small as 14 μm and up to 3.5 mm long. The intensity reached 5 × 10 17 W/cm 2 in a single mode propagating for more than 100 Rayleigh lengths.
author list (cited authors)
Morozov, A., Goltsov, A., Chen, Q., Scully, M., & Suckewer, S.