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Title: Two-color nonvolatile holographic recording in Bridgman-grown Ru:LiNbO3 crystals
Authors: Xu, X.W.
Liang, X.
Li, M.
Solanki, S.
Chong, T.-C. 
Keywords: A1. Doping
A1. Holographic recording
A2. Bridgman growth
B1. Lithium niobate
B2. Photorefractive crystal
Issue Date: Apr-2008
Citation: Xu, X.W., Liang, X., Li, M., Solanki, S., Chong, T.-C. (2008-04). Two-color nonvolatile holographic recording in Bridgman-grown Ru:LiNbO3 crystals. Journal of Crystal Growth 310 (7-9) : 1976-1980. ScholarBank@NUS Repository.
Abstract: The Ru:LiNbO3 crystal with the size of φ25mm×70 mm was grown for the first time by the vertical Bridgman method from the congruent melt doped with a high concentration of 0.05 wt% RuO2. The as-grown crystal was dark brown in color without obvious color change along the growth direction. The optical properties of the crystal were studied along the growth axis (Z) by measuring the optical absorption spectra and OH- absorption peaks. The optical inhomogeneity was improved due to the effective suppression of RuO2 evaporation during the Bridgman growth process. The X-cut sample annealed in air at 950 °C for 5 h exhibited considerable photochromic effect in a wide wavelength range from 360 to 680 nm after the UV illumination. Two-color nonvolatile holographic recording at 632.8 nm was realized in an X-cut as-grown Ru:LiNbO3 crystal with the UV light of 300-400 nm for gating . A high diffraction efficiency of η=41.5% and nonvolatile readout with a fixing ratio of 57.8% were achieved. The crystal had a recording sensitivity of S=0.03 cm/J and a dynamic range of M/#=5.9/cm. The crystal also exhibited a fast erasability and free light-induced scattering at the recording power density of I0=0.23 W/cm2, which are favorable for holographic storage. © 2007 Elsevier B.V. All rights reserved.
Source Title: Journal of Crystal Growth
ISSN: 00220248
DOI: 10.1016/j.jcrysgro.2007.11.057
Appears in Collections:Staff Publications

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