Two-color laser-ionization injection.
Phys Rev Lett
; 112(12): 125001, 2014 Mar 28.
Article
en En
| MEDLINE
| ID: mdl-24724654
ABSTRACT
A method is proposed to generate femtosecond, ultralow emittance (â¼10-8 m rad), electron beams in a laser-plasma accelerator using two lasers of different colors. A long-wavelength pump pulse, with a large ponderomotive force and small peak electric field, excites a wake without fully ionizing a high-Z gas. A short-wavelength injection pulse, with a small ponderomotive force and large peak electric field, copropagating and delayed with respect to the pump laser, ionizes a fraction of the remaining bound electrons at a trapping wake phase, generating an electron beam that is accelerated in the wake.