Self-induced waveguides created by second harmonic generation in lithium niobate

Federico Pettazzi; V. Coda; Mathieu Chauvet; Eugenio Fazio

doi:10.1117/12.722701

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8 May 2007 Self-induced waveguides created by second harmonic generation in lithium niobate

Federico Pettazzi, V. Coda, Mathieu Chauvet, Eugenio Fazio

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Proceedings Volume 6582, Nonlinear Optics and Applications II; 65820E (2007) https://doi.org/10.1117/12.722701
Event: International Congress on Optics and Optoelectronics, 2007, Prague, Czech Republic

Abstract

In this paper we study second harmonic generation in Lithium Niobate in presence of photorefractive and photovoltaic effect. Our investigation reveals that the application of a strong external bias causes a self focusing effect that efficiently traps both the generated second harmonic and the fundamental beam, resulting in an improved conversion efficiency. The variation of the second harmonic output power during the build up of the space charge field also testifies that the phase relation between the interacting waves is affected by the photorefractive effect, and that the phase matching condition is modified in the part of the crystal shined by the light. Finally, we introduce a numerical model in order to explain the complex dynamic between the photorefractive effect and parametric process. The developed theory is in qualitative agreement with the performed experiments.

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Federico Pettazzi, V. Coda, Mathieu Chauvet, and Eugenio Fazio "Self-induced waveguides created by second harmonic generation in lithium niobate", Proc. SPIE 6582, Nonlinear Optics and Applications II, 65820E (8 May 2007); https://doi.org/10.1117/12.722701

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