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Proceedings Paper

Reversible photomodification of LiNbO3 and LiTaO3 by femtosecond laser pulses
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Paper Abstract

We present experimental and theoretical study of refractive index modification induced by femtosecond laser pulses in photorefractive crystals. The single pulses with central wavelength of 800 nm, pulse duration of 150 fs, and energy in the range of 6-130 nJ, tightly focused into the bulk of Fe-doped LiNbO3 and stoichiometric LiTaO3 crystals induce refractive index change of up to about 10-3 within the volume of about (2.0 x 2.0 x 8.0) μm3. The photomodification is independent of the polarization orientation with respect to the crystalline c-axis. The recorded region can be erased optically by a defocused low-intensity single pulse of the same laser. Recording and erasure can be repeated at the same position many times without loss of quality. These findings demonstrate the basic functionality of the ultrafast three-dimensional all-optical rewritable memory. Theoretically they are interpreted by taking into account electron photogeneration and recombination as well as formation of a space-charge field. The presented analysis indicates dominant role of photovoltaic effect for our experimental conditions, and suggests methods for controlling various parameters of the photomodified regions.

Paper Details

Date Published: 8 January 2008
PDF: 11 pages
Proc. SPIE 6801, Photonics: Design, Technology, and Packaging III, 680106 (8 January 2008); doi: 10.1117/12.759232
Show Author Affiliations
Vygantas Mizeikis, Hokkaido Univ. (Japan)
Saulius Juodkazis, Hokkaido Univ. (Japan)
Markas Sudzius, Vilnius Univ. (Lithuania)
Hiroaki Misawa, Hokkaido Univ. (Japan)
Eugene G. Gamaly, The Australian National Univ. (Australia)
Andrei V. Rode, The Australian National Univ. (Australia)
Wieslaw Z. Krolikowski, The Australian National Univ. (Australia)
Kenji Kitamura, National Institute for Materials Science (Japan)


Published in SPIE Proceedings Vol. 6801:
Photonics: Design, Technology, and Packaging III
Wieslaw Z. Krolikowski; Costas M. Soukoulis; Ping Koy Lam; Timothy J. Davis; Shanhui Fan; Yuri S. Kivshar, Editor(s)

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