title: Development of a vacuum ultraviolet laser-based angle-resolved photoemission system with a superhigh energy resolution better than 1 meV.
abstract: The design and performance of the first vacuum ultraviolet (VUV) laser-based angle-resolved photoemission (ARPES) system are described. The VUV laser with a photon energy of 6.994 eV and bandwidth of 0.26 meV is achieved from the second harmonic generation using a novel nonlinear optical crystal KBe2BO3F2. The new VUV laser-based ARPES system exhibits superior performance, including superhigh energy resolution better than 1 meV, high momentum resolution, superhigh photon flux, and much enhanced bulk sensitivity, which are demonstrated from measurements on a typical Bi2Sr2CaCu2O8 high temperature superconductor. Issues and further development related to the VUV laser-based photoemission technique are discussed.
authors.affiliation: National Laboratory for Superconductivity, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, People's Republic of China.
authors.forename: Guodong
authors.initials: G
authors.lastname: Liu
authors.forename: Guiling
authors.initials: G
authors.lastname: Wang
authors.forename: Yong
authors.initials: Y
authors.lastname: Zhu
authors.forename: Hongbo
authors.initials: H
authors.lastname: Zhang
authors.forename: Guochun
authors.initials: G
authors.lastname: Zhang
authors.forename: Xiaoyang
authors.initials: X
authors.lastname: Wang
authors.forename: Yong
authors.initials: Y
authors.lastname: Zhou
authors.forename: Wentao
authors.initials: W
authors.lastname: Zhang
authors.forename: Haiyun
authors.initials: H
authors.lastname: Liu
authors.forename: Lin
authors.initials: L
authors.lastname: Zhao
authors.forename: Jianqiao
authors.initials: J
authors.lastname: Meng
authors.forename: Xiaoli
authors.initials: X
authors.lastname: Dong
authors.forename: Chuangtian
authors.initials: C
authors.lastname: Chen
authors.forename: Zuyan
authors.initials: Z
authors.lastname: Xu
authors.forename: X J
authors.initials: XJ
authors.lastname: Zhou