Laser wakefield excitation and measurement by femtosecond longitudinal interferometry | Zendy

C. W. Siders | Zendy; Sylvie Blanc | Zendy; D. Fisher | Zendy; T. Tajima | Zendy; M. C. Downer | Zendy; A. Babine | Zendy; A. N. Stepanov | Zendy; A. M. Sergeev | Zendy

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Laser wakefield excitation and measurement by femtosecond longitudinal interferometry

Author(s) -

C. W. Siders,

Sylvie Blanc,

D. Fisher,

T. Tajima,

M. C. Downer,

A. Babine,

A. N. Stepanov,

A. M. Sergeev

Publication year - 1996

Language(s) - English

Resource type - Reports

DOI - 10.2172/238564

Subject(s) - atomic physics , plasma , interferometry , physics , laser , femtosecond , ponderomotive force , electron density , amplitude , ionization , ultrashort pulse , langmuir probe , optics , plasma diagnostics , plasma oscillation , excitation , ion , nuclear physics , quantum mechanics

Plasma density oscillations (Langmuir waves) in the wake of an intense (I{sub peak} {approximately} 3 {times} 10{sup 17}W/cm{sup 2}) laser pulse (100 fs) are measured with ultrafast time resolution using a longitudinal interferometric technique. Phase shifts consistent with large amplitude ({delta}n{sub e}/n{sub e} {approximately} 1) density waves at the electron plasma frequency were observed in a fully tunnel-ionized He plasma, corresponding to longitudinal electric fields of {approximately} 10 GV/m. Strong radial ponderomotive forces enhance the density oscillations. As this technique utilizes a necessary component of any laser-based plasma accelerator, it promises to be a powerful tool for on-line monitoring and control of future plasma-based particle accelerators

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