Ultraviolet-light-gating two-color photorefractive effect in Mg-doped near-stoichiometric LiNbO3
JOSA B, Vol. 21, Issue 4, pp. 753-760 (2004)
http://dx.doi.org/10.1364/JOSAB.21.000753
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Abstract
We investigate the ultraviolet- (UV-) light-induced two-color photorefractivity in a near-stoichiometric LiNbO3 crystal doped with Mg above the damage-resistant threshold concentration. Measurements of holographic recording and optical fixing dynamics with a 365-nm gating beam show that complementary shallow and deep gratings are formed during recording and that at least four defect centers are involved in the two-color holographic recording process. It is confirmed that UV-light-induced defect centers O− responsible for the broadband absorption changes act as shallow centers in UV-light-gating two-color holography. These findings indicate that the physical mechanism of the UV-light-gating two-color photorefractive effect in the crystal is essentially different from that of the recently reported two-color photorefractive effect in Mg-doped near-stoichiometric LiNbO3 with a 488-nm gating beam [Appl. Opt. 41, 4891 (2002)].
© 2004 Optical Society of America
OCIS Codes
(090.7330) Holography : Volume gratings
(160.2900) Materials : Optical storage materials
(160.3730) Materials : Lithium niobate
(160.5320) Materials : Photorefractive materials
(190.5330) Nonlinear optics : Photorefractive optics
(210.2860) Optical data storage : Holographic and volume memories
Citation
Yasuo Tomita, Steven Sunarno, and Guoquan Zhang, "Ultraviolet-light-gating two-color photorefractive effect in Mg-doped near-stoichiometric LiNbO3," J. Opt. Soc. Am. B 21, 753-760 (2004)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-21-4-753
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