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Self-aligning concave relativistic plasma mirror with adjustable focus | | Hai-En Tsai
; Alexey V. Arefiev
; Joseph M. Shaw
; David J. Stark
; Xiaoming Wang
; Rafal Zgadzaj
; M. C. Downer
; | | Date: |
6 Oct 2016 | | Abstract: | We report an experimental-computational study of the optical properties of
plasma mirrors (PMs) at the incident laser frequency when irradiated directly
at relativistic intensity (1e18 < I_0 < 1e19 W/cm^2) by near-normally incident
(4 degree), high-contrast, 30 fs, 800 nm laser pulses. We find that such
relativistic PMs are highly reflective (0.6 to 0.8), and focus a significant
fraction of reflected light to intensity as large as 10I_0 at distance f as
small 25 microns from the PM, provided that pre-pulses do not exceed 1e14
W/cm^2 prior to 20 ps before arrival of the main pulse peak. Particle-in-cell
simulations show that focusing results from denting of the reflecting surface
by light pressure combined with relativistic transparency, and that
reflectivity and f can be adjusted by controlling pre-plasma length L over the
range 0.5 < L < 3 microns. Pump-probe reflectivity measurements show the PM’s
focusing properties evolve on a ps time scale. | | Source: | arXiv, 1610.2007 | | Services: | Forum | Review | PDF | Favorites | |
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