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Proceedings Paper

Femtosecond pulsed laser induced phase transition in iron
Author(s): Tomokazu Sano; Hiroaki Mori; Etsuji Ohmura; Isamu Miyamoto
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Paper Abstract

Femtosecond pulsed laser induced phase transition in iron was investigated using electron backscatter diffraction pattern (EBSP) analyzing system in this study. Mirror polished surface of single crystalline iron (purity: 99.99%) was irradiated by femtosecond pulsed laser (wavelength: 800 nm, pulse width: 120 fs, fluence: 2.5 J/cm2, intensity: 1.6x1013 W/cm2, number of pulses: 2000 pulses) in argon atmosphere. Electron beam irradiated the mirror polished vertical section by using colloidal silica under the bottom of the laser irradiated part, and the electron backscatter diffraction pattern was analyzed to determine the crystalline structure. ε phase of hcp structure found to exist around 4 μm deeper from the bottom. γ phase of fcc structure was not detected. This result shows the shock induced by femtosecond pulsed laser irradiation causes the α ↔ ε phase transition. It is suggested that this experimental method has a potential to investigate the existence and its crystalline structure of high pressure and high temperature phase of iron (β phase).

Paper Details

Date Published: 17 October 2003
PDF: 6 pages
Proc. SPIE 4977, Photon Processing in Microelectronics and Photonics II, (17 October 2003); doi: 10.1117/12.479232
Show Author Affiliations
Tomokazu Sano, Osaka Univ. (Japan)
Hiroaki Mori, Osaka Univ. (Japan)
Etsuji Ohmura, Osaka Univ. (Japan)
Isamu Miyamoto, Osaka Univ. (Japan)

Published in SPIE Proceedings Vol. 4977:
Photon Processing in Microelectronics and Photonics II
Alberto Piqué; David B. Geohegan; Friedrich G. Bachmann; Koji Sugioka; Frank Träger; Jan J. Dubowski; Peter R. Herman; Willem Hoving; Kouichi Murakami; Kunihiko Washio; Jim Fieret, Editor(s)

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