Frequency mixing of photorefractive and ferroelectric gratings in lithium niobate crystals.
Holographically recorded photorefractive gratings in periodically poled lithium niobate crystals (PPLNs) are investigated. The principal spatial frequency K of the grating is strongly suppressed. Sideband gratings with grating vectors K +/- G appear. From the measurements the domain grating vector G and the duty cycle of the domain structure can be obtained. These findings allow for fast nondestructive quality inspection of PPLN and are of importance for any optical application combining holography and PPLN.
Institute of Physics, University of Bonn, D-53115 Bonn, Germany. hartwig@physik.uni-bonn.de
U
U
Hartwig
M
M
Kösters
Th
T
Woike
K
K
Buse
A
A
Shumelyuk
S
S
Odoulov