Photorefractive properties of (1-10) and (111)-cut sillenite crystals when external electric field is applied along the direction of the optimum diffraction efficiency |
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| Authors: | NC Deliolanis AG Apostolidis ED Vanidhis DG Papazoglou |
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| Institution: | (1) Aristotle University of Thessaloniki, Department of Physics, Solid State Section 313-1, 541 24 Thessaloniki, Greece, GR;(2) Foundation for Research and Technology-Hellas (FORTH), Institute of Electronic Structure & Laser, P.O. Box 1527, Vassilika Vouton, Heraklion 71110, Crete, Greece, GR |
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| Abstract: | We study the influence of the application of an external electric field on the grating formed in (1-10) and (111)-cut photorefractive
sillenite crystals. Optimum conditions for application of the bias field are examined, taking into account the shift of the
grating orientation for maximum diffraction efficiency along the crystal depth. The contribution of the piezoelectric effect
is considered both in the electro-optic tensor and space charge field calculations. An analysis on the diffractive properties
under these optimum conditions shows an increase of 30% in maximum diffraction efficiency in Bi12GeO20, and experimental verification for this is provided.
Received: 5 November 2001 / Revised version: 18 April 2002 / Published online: 8 August 2002 |
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| Keywords: | PACS: 42 65 Hw 42 70 Mp 42 40 Pa |
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