Characterization of Iron Doped Lithium Niobate for Holographic Storage Applications
Shah, Rajiv R.
Kim, Dae M.
Rabson, Thomas A.
Tittel, Frank K.
A detailed study of eight systematically chosen Fe:LiNb0<sub>3</sub> crystals is presented. Correlation between the photorefractive sensitivity and various chemical properties of Fe:LiNb0<sub>3</sub> is investigated in order to ascertain optimum performance of Fe:LiNb0<sub>3</sub> crystals in holographic storage and display applications. Concentrations of Fe<sup>2+</sup> and Fe<sup>3+</sup> ions have been determined from optical and EPR spectra while impurities have been detected from x-ray emission and infrared spectra. Particular emphasis is placed on investigating the dependence on Fe<sup>3+</sup> ion concentrations of the photorefractive sensitivity. The photorefractive sensitivity is shown to depend primarily on the concentration of Fe<sup>2+</sup> ions in Fe:LiNb0<sub>3</sub>. This fact seems to suggest that Fe<sup>2+</sup> ions are the impurity centers responsible for the photorefractive effect in Fe:LiNb0<sub>3</sub>. Spectral dependence of the photorefractive sensitivity and its modification due to oxygen annealing are also reported. Our results indicate that an unannealed Fe:LiNb0<sub>3</sub> crystal containing 0.05 mole % Fe with 20-25% of the ions in the Fe<sup>2+</sup> state and the remainder in the Fe<sup>3+</sup> state possesses the most favorable photorefractive sensitivity.
holographic; lithium niobate; holographic; lithium niobate
Citable link to this pagehttps://hdl.handle.net/1911/20373
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