title: Demonstration of laser-frequency upshift by electron-density modulations in a plasma wakefield.
abstract: In a plasma wake wave generated by a high power laser, modulations of the electron density take the shape of paraboloidal dense shells, moving almost at the speed of light. A counterpropagating laser pulse is partially reflected from the shells, acting as relativistic flying mirrors, producing a time-compressed frequency-multiplied pulse due to the double Doppler effect. The counterpropagating laser pulse reflection from the plasma wake wave accompanied by its frequency multiplication (with a factor from 50 to 114) was detected in our experiment.
authors.affiliation: Advanced Photon Research Center, JAEA, 8-1 Umemidai, Kizugawa, Kyoto 619-0215, Japan.
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authors.lastname: Kando
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authors.lastname: Fukuda
authors.forename: A S
authors.initials: AS
authors.lastname: Pirozhkov
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authors.lastname: Daito
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authors.lastname: Chen
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authors.lastname: Esirkepov
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authors.lastname: Homma
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authors.lastname: Hayashi
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authors.lastname: Kotaki
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authors.lastname: Sagisaka
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authors.lastname: Mori
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authors.lastname: Koga
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authors.lastname: Bulanov
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authors.lastname: Kimura
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authors.lastname: Kato
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authors.initials: T
authors.lastname: Tajima