Electrical fixing in near-stoichiometric lithium niobate crystals.
Photorefractive gratings are recorded in lithium niobate crystals in the presence of externally applied electric fields close to the coercive field. After optical erasure a voltage pulse above the poling threshold is applied, and by these means a photorefractive grating reappears that can be erased optically. The results point to electrical fixing, i.e., ferroelectric domain reversal induced by a space-charge field.
Eggert
Helge A
HA
Physikalisches Institut, Universität Bonn, Wegelerstrasse 8, D-53115 Bonn, Germany. eggerth@web.de
Hecking
Benedikt
B
Buse
Karsten
K