Comparative study of optical damage and photovoltaic currents in planar LiNbO3 waveguides

O. Caballero; A. Alcazar; J. Herrero; J. Carnicero; C. Ong; M. Domenech; G. Lifante; A. Garcia-Cabanes; J. M. Cabrera; M. Carrascosa

doi:10.1117/12.608199

7 July 2005 Comparative study of optical damage and photovoltaic currents in planar LiNbO₃ waveguides

O. Caballero, A. Alcazar, J. Herrero, J. Carnicero, C. Ong, M. Domenech, G. Lifante, A. Garcia-Cabanes, J. M. Cabrera, M. Carrascosa

Author Affiliations +

Proceedings Volume 5840, Photonic Materials, Devices, and Applications; (2005) https://doi.org/10.1117/12.608199
Event: Microtechnologies for the New Millennium 2005, 2005, Sevilla, Spain

Abstract

The optical damage behaviour of different LiNbO₃ optical waveguides has been experimentally studied by measuring the intensity output of a single beam as a function of the intensity input. Parallel measurements of photovoltaic currents have been carried out as a function of the input intensity and they have been correlated with the optical damage data. The following LiNbO₃ guides have been studied and compared: proton exchanged (PE) belonging to the phases alpha, beta₁, beta₂ and reverse proton exchanged (RPE), and Zn in-diffused waveguides. The greatest intensity thresholds for optical damage, about 2x10³ times greater than that of the substrate, have been obtained in RPE guides (they support ordinary polarization and have similar nonlinear optic activity as the substrate) and beta₂ guides which support extraordinary polarization (they have no nonlinear optic activity). On the other hand, the lowest photovoltaic currents have been measured in beta_1,2-phases. As a function of the light intensity, the photovoltaic current exhibits a superlinear behaviour, strong in alpha-phase and weaker in Zn in-diffused and RPE guides. The results for optical damage are discussed in connection with those of photovoltaic currents, paying particular attention to the main mechanisms involved.

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O. Caballero, A. Alcazar, J. Herrero, J. Carnicero, C. Ong, M. Domenech, G. Lifante, A. Garcia-Cabanes, J. M. Cabrera, and M. Carrascosa "Comparative study of optical damage and photovoltaic currents in planar LiNbO₃ waveguides", Proc. SPIE 5840, Photonic Materials, Devices, and Applications, (7 July 2005); https://doi.org/10.1117/12.608199

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