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Proceedings Paper

Powerful pulsed THz radiation from laser-accelerated relativistic electron bunches
Author(s): Csaba Toth; Jeroen van Tilborg; Cameron G.R. Geddes; Gwenael Fubiani; Carl B. Schroeder; Eric Esarey; Jerome Faure; Gerald Dugan; Wm P. Leemans
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Paper Abstract

Coherent THz radiation was produced from relativistic electron bunches of subpicosecond duration. The electron beam was produced by strongly focused (≈ 6 μm), high peak power (up to 10 TW), ultra-short (≥50 fs) laser pulses of a 10 Hz repetition rate Ti:sapphire chirped pulse amplification (CPA) laser system via self-modulated laser wakefield acceleration (SM-LWFA) in a high density (> 1019 cm-3) pulsed gas jet. As the electrons exit the plasma, coherent transition radiation is generated at the plasma-vacuum boundary for wavelengths long compared to the bunch length. Radiation yield in the 0.3 to 19 THz range and at 94 GHz has been measured and found to depend quadratically on the bunch charge. The measured total radiated energy in the THz range for two different collection angles is in good agreement with theory. Modeling indicates that optimization of this table-top source could provide more than 100 μJ/pulse. Together with intrinsic synchronization to the laser pulse, this will enable numerous applications requiring intense terahertz radiation. This radiation can also be applied as a useful tool for measuring the properties of laser accelerated bunches at the exit of the plasma accelerator.

Paper Details

Date Published: 20 September 2004
PDF: 14 pages
Proc. SPIE 5448, High-Power Laser Ablation V, (20 September 2004); doi: 10.1117/12.548945
Show Author Affiliations
Csaba Toth, Lawrence Berkeley National Lab. (United States)
Jeroen van Tilborg, Lawrence Berkeley National Lab. (United States)
Cameron G.R. Geddes, Lawrence Berkeley National Lab. (United States)
Gwenael Fubiani, Lawrence Berkeley National Lab. (United States)
Carl B. Schroeder, Lawrence Berkeley National Lab. (United States)
Eric Esarey, Lawrence Berkeley National Lab. (United States)
Jerome Faure, Lawrence Berkeley National Lab. (United States)
Gerald Dugan, Cornell Univ. (United States)
Wm P. Leemans, Lawrence Berkeley National Lab. (United States)


Published in SPIE Proceedings Vol. 5448:
High-Power Laser Ablation V
Claude R. Phipps, Editor(s)

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