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

Vygantas Mizeikis; Arturas Vailionis; Eugene G. Gamaly; Wenge Yang; Andrei V. Rode; Saulius Juodkazis

doi:10.1117/12.906946

8 February 2012 Synthesis of super-dense phase of aluminum under extreme pressure and temperature conditions created by femtosecond laser pulses in sapphire

Vygantas Mizeikis, Arturas Vailionis, Eugene G. Gamaly, Wenge Yang, Andrei V. Rode, Saulius Juodkazis

Author Affiliations +

Proceedings Volume 8249, Advanced Fabrication Technologies for Micro/Nano Optics and Photonics V; 82490A (2012) https://doi.org/10.1117/12.906946
Event: SPIE MOEMS-MEMS, 2012, San Francisco, California, United States

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.

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Vygantas Mizeikis, Arturas Vailionis, Eugene G. Gamaly, Wenge Yang, Andrei V. Rode, and Saulius Juodkazis "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 (8 February 2012); https://doi.org/10.1117/12.906946

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