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  • CLEO/Europe and EQEC 2011 Conference Digest
  • OSA Technical Digest (CD) (Optica Publishing Group, 2011),
  • paper CG_P7

Stable Relativistic UV Self-Channeling in Multi-Layer Gel Targets

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Abstract

In the case of relativistic and ponderomotive self-channeling [1] of ultra-powerful laser pulses in high-density plasmas, when the initial laser peak power is much greater than the critical power and the incident radius is much larger than the radius of the relativistic channel, highly unstable filamentation is the dominant mode of propagation [2]. This fully unstable self-channeling mode is characterized by the formation of multiple peripheral filaments each carrying a power on the order of the critical power for relativistic self-focusing. It has been demonstrated and experimentally verified that the unstable mode of relativistic self-channeling of ultra-powerful laser pulses in high-density gas targets can be converted into ultra-powerful stable channel formation using a two-stage relativistic self-channeling process, with the initial phase involving an appropriate gradient in the longitudinal gas density profile [3-6]. The present paper reports the stability control for relativistic and ponderomotive self-channeling of ultra-intense UV laser pulses in high-density gel targets. It has been demonstrated that the characteristic unstable mode of relativistic and ponderomotive self-channeling of ultra-intense laser pulses in high-density gel targets can be converted into stable single channel formation using multilayer gel compositions with the increasing density in each following layer. The stable relativistic self-channeling of 2.5 TW UV laser pulses in multi-layer gel targets with the electron density equals to 0.25 of critical density in the final layer results in the formation of stable single channel with the trapped power exceeding 30 critical powers and peak channel intensity in the range of 2 × 1021 W/cm2 (see Fig. 1).

© 2011 Optical Society of America

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