Femtosecond pulsed laser induced phase transition in iron

Tomokazu Sano; Hiroaki Mori; Etsuji Ohmura; Isamu Miyamoto

doi:10.1117/12.479232

17 October 2003 Femtosecond pulsed laser induced phase transition in iron

Tomokazu Sano, Hiroaki Mori, Etsuji Ohmura, Isamu Miyamoto

Proceedings Volume 4977, Photon Processing in Microelectronics and Photonics II; (2003) https://doi.org/10.1117/12.479232
Event: High-Power Lasers and Applications, 2003, San Jose, CA, United States

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).

Citation Download Citation

Tomokazu Sano, Hiroaki Mori, Etsuji Ohmura, and Isamu Miyamoto "Femtosecond pulsed laser induced phase transition in iron", Proc. SPIE 4977, Photon Processing in Microelectronics and Photonics II, (17 October 2003); https://doi.org/10.1117/12.479232

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