Generation of Circularly Polarized X-ray Free-Electron Laser (Press Release)
- Release Date
- 23 Apr, 2014
- SACLA
RIKEN
Japan Synchrotron Radiation Research Institute (JASRI)
Key Points
• Successful installation of an optical device that can generate circularly polarized X-ray free-electron laser beams at SACLA
• Demonstration of full control of X-ray polarization states of XFEL using a diamond crystal
• Possible applications to observation of ultrafast dynamics of electron spins as well as chiral structural dynamics
A research group of RIKEN (President, Ryoji Noyori) and JASRI (President, Yoshiharu Doi) has installed a new instrument at the X-ray free-electron laser (XFEL) facility, SACLA[1], for full control of polarization states[2] of XFEL radiation. This device has successfully worked to generate a circularly polarized XFEL beam. The beam would be a powerful tool for exploring new scientific fields including ultrafast magnetization dynamics in magnetic materials and chiral structural dynamics in inorganic/organic materials. The research group was led by Motohiro Suzuki (senior scientist) of Research & Utilization Division, JASRI (visiting scientist at RIKEN) and Makina Yabashi (group director) of Beam Line Research and Development Group, RIKEN SPring-8 Center (Director, Tetsuya Ishikawa). Publication: |
《Figures》
A linearly polarized XFEL beam from SACLA is going through a diamond crystal and converted into circular polarization.
A diamond crystal is placed in the vacuum chamber.
Dots show the experimental result, and the line shows the result of theoretical calculation. Right- (left-) handed circular polarization was generated at a crystal angle of –31 (+31) arcsec.
《Supplementary explanations》
[1]SACLA
SACLA is a Japanese X-ray free-electron laser (XFEL) facility and was constructed jointly by RIKEN and JASRI. It is a system for generating an X-ray laser from electrons oscillating coherently. SACLA has been developed as one of the national core technologies. Its construction and preparation was launched in FY2006 in a five-year project and was completed in March 2011. The name SACLA is short for SPring-8 angstrom compact free-electron laser.
[2]Polarization, linear polarization, circular polarization
Light and X-rays are types of electromagnetic waves. An electromagnetic wave oscillating in a fixed direction or regular manner is defined as 'polarized light (X-rays)'. Linear polarization refers to a light (X-ray) wave with which the electric field vector is oscillating in a plane; circular polarization refers to a wave with which the electric field vector is rotating spirally.
[3]Chiral material
Material that has a helical structure in the atomic arrangement. Typical chiral materials include some organic molecules: amino acid, sugar, adrenaline, and inorganic crystals: quartz, and tellurium. Some chiral materials may be applied to development of novel multifunctional materials for the next-generation electronic devices.
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