The Review of Laser Engineering
Online ISSN : 1349-6603
Print ISSN : 0387-0200
ISSN-L : 0387-0200
X-ray Free Electron Laser (XFEL) Observation of Lonsdaleite Formation by Ultrafast Laser Shock Compression
Kento KATAGIRI, Norimasa OZAKI, Takahiro MATSUOKA, Takeshi MATSUOKA, Kohei MIYANISHI, Yusuke SETO, Yuhei UMEDA, Minoru HOSOMI, Shintaro MORIOKA, Yuichi INUBUSHI, Tadashi TOGASHI, Toshinori YABUUCHI, Makina YABASHI, Ryosuke KODAMA
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Keywords: Laser shock compression, XFEL, HOPG, X-ray diffraction, Lonsdaleite
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2019 Volume 47 Issue 1 Pages 47-

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Abstract
We directly observed laser shock-induced, anomalous elastic compression of highly oriented pyrolytic graphite (HOPG) and subsequent phase transition to lonsdaleite at a longitudinal stress of ~30 GPa using an X-ray Free Electron Laser (XFEL). The observed phase transition is diffusionless and most likely relaxes a strong shear stress in the highly elastically compressed lattice. Our experimental results show that this diffusionless transformation depends on the mosaic spread of Highly Oriented Pyrlolytic Graphite (HOPG) samples.
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© 2019 by The Laser Society of Japan
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