High intensity behavior of pyroelectric photorefractive self-focusing in LiNbO3
Résumé
The formation of self-confined beams using pyroelectric effect is numerically and experimentally studied in photorefractive LiNbO3. For a given crystal temperature change, the trapped beam width is shown to be less efficient as intensity is increased. Numerical calculations reveal that the induced refractive-index profile varies along propagation for large intensities due to a nonlinear photovoltaic effect. Moreover, it eventually gives beam splitting for intensities greater than a threshold intensity that depends on LiNbO3 composition.
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High_intensity_behavior_of_pyroelectric_photorefractive_self-focusing_2013_preprint.pdf (275.75 Ko)
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