Two-color laser-ionization injection.
A method is proposed to generate femtosecond, ultralow emittance (∼10-8  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.
Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA and Department of Physics, University of California, Berkeley, California 94720, USA and Key Laboratory for Laser Plasmas (Ministry of Education), Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China.
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Yu
Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
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Esarey
Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
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Schroeder
Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
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Vay
Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
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Benedetti
Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
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Geddes
Key Laboratory for Laser Plasmas (Ministry of Education), Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China.
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Chen
Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA and Department of Physics, University of California, Berkeley, California 94720, USA.
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Leemans