Near-infrared holographic photorefractive recording under applied electric field in undoped Bi$_{12}$TiO$_{20}$ sillenite crystal

Abstract

Holographic recording in Bi 12 TiO 20 crystal at 1064 nm is investigated aiming the characterization of diffraction efficiency under action of applied dc electric field (E 0 ). An enhancement of 12-fold in the diffraction efficiency was revealed when E 0 increased from 0.0 to 4.2 kV/cm. The theoretical dependence of the diffraction efficiency upon E 0 was investigated using the standard model for photorefractivity and the results showed a good experimental data fitting, allowing the computation of the acceptor concentration in the crystal of ≈ 5.3 × 10 15 cm −3 .