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Proceedings Paper

Development of automatically optimizing system of both spatial and temporal beam shaping for UV-laser pulse
Author(s): H. Tomizawa; H. Dewa; H. Hanaki
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Paper Abstract

Beam quality control methods are important topics for laser beam users. In particular, highly controlled spatial and temporal profiles of a shot-by-shot single laser pulse are widely required for different scientific fields. We are developing a maintenance-free, highly qualified UV-laser pulse as a light source of the photo-cathode rf electron gun for the injector of a free electron laser (FEL) at SPring-8. The improvement of the UV-laser profile is essential for emittance reduction in the electrom beam from the rf gun. We planned to use a deformable mirror for spatial shaping, and a spatial light modulator (SLM) for temporal shaping at the same time. As the first test run, using a microlens array in a spatial filter, the spatila profile of the UV laser as a light source for the rf gun was improved. As a result, we obtained a minimum emittance value of 2π mm x mrad with a beam energy of 3.1 MeV, holding its charge to 0.1 nC/bunch. In the next test run, we applied a deformable mirror to automatically shape the spatial UV-laser profile with a feedback routine based on genetic algorithms. We report herein the principle and developing process of our beam quality control systems.

Paper Details

Date Published: 15 March 2004
PDF: 9 pages
Proc. SPIE 5481, Laser Optics 2003: Wavefront Transformation and Laser Beam Control, (15 March 2004); doi: 10.1117/12.558312
Show Author Affiliations
H. Tomizawa, Japan Synchrotron Radiation Research Institute (Japan)
H. Dewa, Japan Synchrotron Radiation Research Institute (Japan)
H. Hanaki, Japan Synchrotron Radiation Research Institute (Japan)

Published in SPIE Proceedings Vol. 5481:
Laser Optics 2003: Wavefront Transformation and Laser Beam Control
Vladimir E. Sherstobitov; Leonid N. Soms, Editor(s)

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