title: Widely Tunable Two-Color Free-Electron Laser on a Storage Ring.
abstract: With a wide wavelength tuning range, free-electron lasers (FELs) are well suited for producing simultaneous lasing at multiple wavelengths. We present the first experimental results of a novel two-color storage ring FEL. With three undulators and a pair of dual-band mirrors, the two-color FEL can lase simultaneously in infrared (IR) around 720 nm and in ultraviolet (UV) around 360 nm. We have demonstrated independent wavelength tuning in a wide range (60 nm in IR and 24 nm in UV). We have also realized two-color harmonic operation with the UV lasing tuned to the second harmonic of the IR lasing. Furthermore, we have demonstrated good power stability with two-color lasing, and good control of the power sharing between the two colors.
authors.affiliation: FEL Laboratory, TUNL and Department of Physics, Duke University, Durham, North Carolina 27708-0319, USA.
authors.forename: Y K
authors.initials: YK
authors.lastname: Wu
authors.affiliation: FEL Laboratory, TUNL and Department of Physics, Duke University, Durham, North Carolina 27708-0319, USA.
authors.forename: J
authors.initials: J
authors.lastname: Yan
authors.affiliation: FEL Laboratory, TUNL and Department of Physics, Duke University, Durham, North Carolina 27708-0319, USA.
authors.forename: H
authors.initials: H
authors.lastname: Hao
authors.affiliation: FEL Laboratory, TUNL and Department of Physics, Duke University, Durham, North Carolina 27708-0319, USA.
authors.forename: J Y
authors.initials: JY
authors.lastname: Li
authors.affiliation: FEL Laboratory, TUNL and Department of Physics, Duke University, Durham, North Carolina 27708-0319, USA.
authors.forename: S F
authors.initials: SF
authors.lastname: Mikhailov
authors.affiliation: FEL Laboratory, TUNL and Department of Physics, Duke University, Durham, North Carolina 27708-0319, USA.
authors.forename: V G
authors.initials: VG
authors.lastname: Popov
authors.affiliation: Budker Institute of Nuclear Physics, Novosibirsk 630090, Russia.
authors.forename: N A
authors.initials: NA
authors.lastname: Vinokurov
authors.affiliation: Institute of Heavy Ion Physics, School of Physics, Peking University, Beijing 100871, China.
authors.forename: S
authors.initials: S
authors.lastname: Huang
authors.affiliation: SLAC National Accelerator Laboratory, Stanford University, Stanford, California 94309, USA.
authors.forename: J
authors.initials: J
authors.lastname: Wu