Investigation of internal electric field in LiNbO<sub>3</sub> crystal with two anti-parallel ferroelectric domains by interferometric technique

Melania Paturzo; Domenico Alfieri; Simonetta Grilli; Pietro Ferraro; Marella de Angelis; Sergio De Nicola; Lucia Sansone; Paolo De Natale; Giovanni Pierattini

doi:10.1117/12.560643

22 October 2004 Investigation of internal electric field in LiNbO₃ crystal with two anti-parallel ferroelectric domains by interferometric technique

Melania Paturzo, Domenico Alfieri, Simonetta Grilli, Pietro Ferraro, Marella de Angelis, Sergio De Nicola, Lucia Sansone, Paolo De Natale, Giovanni Pierattini

Author Affiliations +

Proceedings Volume 5560, Photorefractive Fiber and Crystal Devices: Materials, Optical Properties, and Applications X; (2004) https://doi.org/10.1117/12.560643
Event: Optical Science and Technology, the SPIE 49th Annual Meeting, 2004, Denver, Colorado, United States

Abstract

Large built-in internal field is present in congruent LiNbO₃ and is due to bulk dipolar defect complexes of nonstoichiometric crystals. This field influence electric field switching of domains as well as other optical and electrical properties of crystals. Moreover it's time-temperature dependent and this feature can bias the stability of LiNbO₃ based devices. We investigate how the internal field could affect the electro-optic effect. To this aim an improved interferometric technique is used to obtain a spatially resolved measurement of the electro-optic coefficient of z-cut LiNbO₃ crystals. The samples are mounted in one arm of a reflective grating interferometer and resulting fringes patterns are visualized and stored by a CCD camera. Then this as-recorded data are processed by digital holographic technique in order to obtain 2D phase maps as function of the applied voltage across the crystal thickness. Hence spatial distribution of r₁₃ is achieved for crystal either in virgin state or in domain reversed one. Moreover, samples just after poling with two anti-parallel ferroelectric domains structure have been studied. Results show that the virgin area and the reversed one have quite different r₁₃ coefficient values. We suppose that this difference is due to the internal field, however further measurements are currently under investigation to confirm this hypothesis.

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Melania Paturzo, Domenico Alfieri, Simonetta Grilli, Pietro Ferraro, Marella de Angelis, Sergio De Nicola, Lucia Sansone, Paolo De Natale, and Giovanni Pierattini "Investigation of internal electric field in LiNbO₃ crystal with two anti-parallel ferroelectric domains by interferometric technique", Proc. SPIE 5560, Photorefractive Fiber and Crystal Devices: Materials, Optical Properties, and Applications X, (22 October 2004); https://doi.org/10.1117/12.560643

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