Open AccessDevelopment of optical choppers for time‐resolved measurements at soft X‐ray synchrotron radiation beamlines
Author(s) -
Osawa Hitoshi,
Ohkochi Takuo,
Fujisawa Masami,
Kimura Shigeru,
Kinoshita Toyohiko
Publication year - 2017
Publication title -
journal of synchrotron radiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.172
H-Index - 99
ISSN - 1600-5775
DOI - 10.1107/s1600577517002399
Subject(s) - synchrotron radiation , beamline , optics , spring 8 , physics , synchrotron , advanced photon source , high energy x rays , undulator , particle accelerator , materials science , radiation , beam (structure)
Two types of optical choppers for time‐resolved measurements at synchrotron radiation soft X‐ray beamlines have been developed. One type uses an air‐spindle‐type rotation mechanism with a two‐stage differential pumping system to maintain the ultra‐high vacuum of the X‐ray beamline, and the other uses a magnetic bearing. Both can be installed at the soft X‐ray beamlines at SPring‐8, greatly improving the accessibility of pump‐and‐probe spectroscopy. The combination of X‐ray chopper and pump‐and‐probe photoemission electron microscope at SPring‐8 provides drastic improvements in signal‐to‐noise ratio and resolution compared with techniques using high‐voltage gating of channel plate detectors. The choppers have the capability to be used not only at synchrotron radiation facilities but also at other types of soft X‐ray and VUV beamlines.