We study the formation of 2D self-trapped beams in nanodisordered potassium-sodium-tantalate-niobate (KNTN) cooled below the dynamic glass transition. Supercooling is shown to accelerate the photorefractive response and enhance steady-state anisotropy. Effects in the excited state are attributed to the anomalous slim-loop polarization curve typical of relaxors dominated by non-interacting polar-nano-regions.
© 2014 Optical Society of America
Original Manuscript: October 17, 2013
Revised Manuscript: February 10, 2014
Manuscript Accepted: February 11, 2014
Published: March 14, 2014
D. Pierangeli, J. Parravicini, F. Di Mei, G. B. Parravicini, A. J. Agranat, and E. DelRe, "Photorefractive light needles in glassy nanodisordered KNTN," Opt. Lett. 39, 1657-1660 (2014)