High-gain lasing and polarization switch with a distributed optical-klystron free-electron laser.
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.
Wu
Y K
YK
Department of Physics, Duke University, Durham, North Carolina 27708-0319, USA. wu@fel.duke.edu
Vinokurov
N A
NA
Mikhailov
S
S
Li
J
J
Popov
V
V