Two-dimensional mapping of electro-optic phase retardation in lithium niobate crystals by digital holography |
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Authors: | de Angelis M De Nicola S Finizio A Pierattini G Ferraro P Grilli S Paturzo M Sansone L Alfieri D De Natale P |
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Institution: | Istituto di Cibernetica del Consiglio Nazionale delle Ricerche, Via Campi Flegrei 34, 80078-Pozzuoli (NA), Italy. marella.deangelis@na.infn.it |
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Abstract: | We demonstrate accurate two-dimensional mapping of the phase retardation induced by the electro-optic effect in lithium niobate crystals. Off-axis digital holography is used to investigate congruent z-cut crystals. The spatially resolved optical path difference is interferometrically measured while a linearly rising voltage ramp is applied to the crystal. This procedure provides information on the uniformity of crystals' electro-optic properties and offers the ability to detect the presence of defects that is of fundamental importance for reliable processing of photonic devices. |
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