15 March 2004 Development of automatically optimizing system of both spatial and temporal beam shaping for UV-laser pulse
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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.
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H. Tomizawa, H. Tomizawa, H. Dewa, H. Dewa, H. Hanaki, H. Hanaki, } "Development of automatically optimizing system of both spatial and temporal beam shaping for UV-laser pulse", Proc. SPIE 5481, Laser Optics 2003: Wavefront Transformation and Laser Beam Control, (15 March 2004); doi: 10.1117/12.558312; https://doi.org/10.1117/12.558312
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