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Proceedings Paper

Production of picosecond square-shaped ultraviolet pulses for low-emittance electron bunch generation from an RF photocathode
Author(s): Akira Yada; Kazuya Takasago; Shinji Ito; Tatsuya Yanagida; Jinfeng Yang; Masakazu Washio; Kenji Torizuka; Akira Endo
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Paper Abstract

We demonstrated generation of square-shaped ultraviolet pulses and that they reduces the emittance of electron beams from laser-photocathode RF-gun. Some frequency components of femtosecond pulses from a Ti:sapphire oscillator are modulated with a pulse shaper that consists of a lens pair, gratings, and a liquid crystal spatial light modulator (LC-SLM) to generate square-shaped pulses. The shaped pulses were amplified up to 3 mJ through a regenerative amplifier, and were converted to ultraviolet region with two different nonlinear crystals. Energy of the shaped pulses was about 100 (mu) J which is sufficient to generate electron charge of 1 nC. In our experiment, emittance of electron beam was reduced to as low as almost the half of that with non-shaped pulses.

Paper Details

Date Published: 6 June 2002
PDF: 9 pages
Proc. SPIE 4629, Laser Resonators and Beam Control V, (6 June 2002); doi: 10.1117/12.469490
Show Author Affiliations
Akira Yada, Waseda Univ. (Japan)
Kazuya Takasago, Femtosecond Technology Research Association (Japan)
Shinji Ito, Femtosecond Technology Research Association (Japan)
Tatsuya Yanagida, Sumitomo Heavy Industries, Ltd. (Japan)
Jinfeng Yang, Sumitomo Heavy Industries, Ltd. (Japan)
Masakazu Washio, Waseda Univ. (Japan)
Kenji Torizuka, National Institute of Advanced Industrial Science and Technology (Japan)
Akira Endo, Femtosecond Technology Research Association (Japan)

Published in SPIE Proceedings Vol. 4629:
Laser Resonators and Beam Control V
Alexis V. Kudryashov, Editor(s)

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