High-gain lasing and polarization switch with a distributed optical-klystron free-electron laser |
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Authors: | Wu Y K Vinokurov N A Mikhailov S Li J Popov V |
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Institution: | Department of Physics, Duke University, Durham, North Carolina 27708-0319, USA. wu@fel.duke.edu |
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Abstract: | This Letter reports the first experimental results from the world's first distributed optical-klystron (DOK) free-electron laser (FEL), the DOK-1 FEL, at Duke University. The DOK-1 FEL is a hybrid system, comprised of four wigglers: two horizontal and two helical. With the DOK-1 FEL, we have obtained the highest FEL gain among all storage ring based FELs at 47.8% (+/-2.7%) per pass. We have also demonstrated that the FEL gain can be enhanced by increasing electron bunching using wigglers with a different polarization. Furthermore, we have realized controlled polarization switches of the FEL beam by a nonoptical means through the manipulation of a buncher magnet. |
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