Three-dimensional write-read-erase memory bits by femtosecond laser pulses in photorefractive LiNbO3 crystals

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Title: Three-dimensional write-read-erase memory bits by femtosecond laser pulses in photorefractive LiNbO3 crystals
Author(s): Gamaly, Eugene G.; Juodkazis, Saulius; Mizeikis, Vygantas; Misawa, Hiroaki; Rode, Andrei V.; Krolikowski, Wieslaw Z.; Kitamura, Kenji
Abstract: We report on a three-dimensional single-shot optical recording by 150 fs pulses at 800 nm wavelength in Fe-doped and stoichiometric undoped LiNbO3. The highest refractive index modulation of ∼10−3 per single pulse has been achieved at close to the dielectric breakdown irradiance of ∼TW/cm2, and was found to be independent of polarization of the writing beam. The quasi-permanent and rewritable bits have been demonstrated in Fe-doped LiNbO3. Recording in undoped stoichiometric LiNbO3 was of transient nature with full optical contrast recovery on a 0.1-1 s scale. The observed refractive index modulation is explainable by the photovoltaic effect in LiNbO3.
Publication type: Journal article
Source: Current Applied Physics: proceedings of the Third International Conference on Advanced Materials and Nanotechnology (AMN-3), Wellington, New Zealand, 11-16 February 2007, Vol. 8, no. 3-4 (May 2008), pp. 416-419
Publication year: 2008
FOR Code(s): 01 Mathematical Sciences; 02 Physical Sciences
Keyword(s): Femtosecond laser microfabrication; Lithium niobate; Photovoltaic effect; Three-dimensional optical memory
Publisher: Elsevier
ISSN: 1567-1739
Publisher URL: http://dx.doi.org/10.1016/j.cap.2007.10.072
Peer reviewed