Contrast Effect on the Laser Injected Electron Beam.

Laser-plasma interaction generates a high energy electron beam. The laser contrast ratio is one of the important parameters for laser acceleration due to pre-plasma effects. For the high laser contrast ratio, a 140 MeV monoenergetic electron beam with a charge of 100 pC is obtained. For the low laser contrast ratio; a low quality electron beam or no electron beam are generated, because the pre-pulse blowout plasma electrons and put into disorder the plasma before the main pulse interacting the plasma. The laser contrast ratio should be high in order to generate a high quality electron beam with a high charge. [ABSTRACT FROM AUTHOR]