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Proceedings Article

Synthesis of super-dense phase of aluminum under extreme pressure and temperature conditions created by femtosecond laser pulses in sapphire

[+] Author Affiliations
Vygantas Mizeikis

Shizuoka Univ. (Japan)

Arturas Vailionis

Stanford Univ. (USA)

Eugene G. Gamaly, Andrei V. Rode

The Australian National Univ. (Australia)

Wenge Yang

Carnegie Institution (USA)

Saulius Juodkazis

Swinburne Univ. of Technology (Australia)

Proc. SPIE 8249, Advanced Fabrication Technologies for Micro/Nano Optics and Photonics V, 82490A (February 9, 2012); doi:10.1117/12.906946
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From Conference Volume 8249

  • Advanced Fabrication Technologies for Micro/Nano Optics and Photonics V
  • Winston V. Schoenfeld; Raymond C. Rumpf; Georg von Freymann
  • San Francisco, California, USA | January 21, 2012

abstract

We describe synthesis of a new super-dense phase of aluminum under extreme pressure and temperature conditions created by laser-induced microexplosions in sapphire. Micro explosions in sub-micrometer sized regions of sapphire were induced by tightly-focused femtosecond laser pulses with a temporal length of ~ 100 fs and an energy of ~ 100 nJ. Fast, explosive expansion of photogenerated high-density plasma created strong heating and pressure transients with peak temperature and pressure of ~ 105 K and 10 TPa, respectively. Partial decomposition of sapphire in the shock-compressed sapphire led to formation of nanocrystalline bcc-Al phase, which is different from ambient fcc-Al phase, and was permanently preserved by fast quenching. The existence of super-dense bcc-Al phase was confirmed using X-ray diffraction technique. This is the first observation of bcc-Al phase, which so far has been only predicted theoretically, and a demonstration that laser-induced micro explosions technique enables simple, safe and cost-efficient access to extreme pressures and temperatures without the tediousness typical to traditional techniques that use diamond anvil cells, gas guns, explosives, or megajoule-class lasers.

© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Citation

Vygantas Mizeikis ; Arturas Vailionis ; Eugene G. Gamaly ; Wenge Yang ; Andrei V. Rode, et al.
"Synthesis of super-dense phase of aluminum under extreme pressure and temperature conditions created by femtosecond laser pulses in sapphire", Proc. SPIE 8249, Advanced Fabrication Technologies for Micro/Nano Optics and Photonics V, 82490A (February 9, 2012); doi:10.1117/12.906946; http://dx.doi.org/10.1117/12.906946


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