Simulations show that field-ionized electrons in a focused radially polarized laser can be accelerated backward as well as forward, with forward energies rising toward GeV at longer wavelengths.
Laser Acceleration of Relativistic Electrons Using the Inverse Cherenkov Effect
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Forward and Backward Electron Acceleration by Radially Polarized Ultra-Intense Laser Focus Seeded By Field Ionization of High Charge States of Neon
Simulations show that field-ionized electrons in a focused radially polarized laser can be accelerated backward as well as forward, with forward energies rising toward GeV at longer wavelengths.