Development of optical choppers for time-resolved measurements at soft X-ray synchrotron radiation beamlines
Japan Synchrotron Radiation Research Institute (JASRI)
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Development of optical choppers for time-resolved measurements at soft X-ray synchrotron radiation beamlines
- Author:
Hitoshi Osawa, Takuo Ohkochi, Masami Fujisawa, Shigeru Kimuraa and Toyohiko Kinoshita
Two types of optical choppers for time-resolved measurements at synchrotron radiation soft X-ray beamlines have been developed. One type uses an airspindle-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.
