Fanning scattering in LiNbO3 at 750–850 nm induced by femtosecond laser pulses

We observed a light-induced fanning scattering in LiNbO3 at 750–850 nm, using femtosecond laser and without pumping. The fanning scattering is just like the ordinary one. After comparing the phenomena of some crystals, which were doped with different ions and one was oxided, and studying the threshold of the scattering, we think the scattering is owing to the small polarons formed by the self-gating of the bipolarons. 2003 Elsevier Science B.V. All rights reserved.