Journal
CURRENT APPLIED PHYSICS
Volume 8, Issue 3-4, Pages 416-419Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.cap.2007.10.072
Keywords
lithium niobate; three-dimensional optical memory; femtosecond laser microfabrication; photovoltaic effect
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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 similar to 10(-3) per single pulse has been achieved at close to the dielectric breakdown irradiance of similar to TW/cm(2), 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. (c) 2007 Elsevier B.V. All rights reserved.
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