Abstract

We report the anisotropic focusing characteristics of a spherically configured region of microdomains that have been induced within a cubic-shaped crystal of Ce-doped Sr_0.61Ba_0.39Nb₂O₆. The internal spherical structure focuses extraordinary polarized light, but not ordinary polarized light. The spherical region, which is easily observed via scattering, is formed as the crystal cools after a repoling cycle through the Curie temperature, with an applied field. Analytic modeling of the thermal gradients that exist within the crystal during cooling reveals a small (<1 °C) temperature difference between the central and the outside regions. The similarity in shape between these temperature profiles and the observed scattering region suggests a possible mechanism for the growth of this spherical microdomained structure.

© 1997 Optical Society of America

Light-induced charge transport properties of Sr_0.61Ba_0.39Nb₂O₆:Ce crystals

K. Buse, U. van Stevendaal, R. Pankrath, and E. Krätzig
J. Opt. Soc. Am. B 13(7) 1461-1467 (1996)

Tilting of holograms in photorefractive Sr_0.61Ba_0.39Nb₂O₆ crystals by self-diffraction

K. Buse, S. Kämper, J. Frejlich, R. Pankrath, and K. H. Ringhofer
Opt. Lett. 20(21) 2249-2251 (1995)

Pyroelectrically induced photorefractive effect in Sr_0.61Ba_0.39Nb₂O₆:Ce

K. Buse, R. Pankrath, and E. Krätzig
Opt. Lett. 19(4) 260-262 (1994)

Second-harmonic generation in quasi-periodically domain-inverted Sr_0.6Ba_0.4Nb₂O₆ optical superlattices

Y. Y. Zhu, R. F. Xiao, J. S. Fu, G. K. L. Wong, and Nai-ben Ming
Opt. Lett. 22(18) 1382-1384 (1997)

Investigation into self-pumped and mutually pumped phase conjugation with beams entering the negative c face of doped (K_0.5Na_0.5)_0.2(Sr_0.75Ba_0.25)_0.9Nb₂O₆ crystals

Jingwen Zhang, Huimin Liu, and Weiyi Jia
Appl. Opt. 36(16) 3753-3761 (1997)