Experimental results that demonstrate the formation of photorefractive gratings in KTN:Cu,V in the paraelectric phase are presented. These gratings are formed using the quadratic electro-optic effect, which allows amplitude modulation of the diffracted beam by an external electric field. High diffraction efficiencies of over 50% in a 3-mm-thick sample and amplitude modulation of the diffracted beam by an external field at frequencies of up to 20 kHz were observed.
© 1989 Optical Society of America
Original Manuscript: February 17, 1989
Manuscript Accepted: June 11, 1989
Published: September 15, 1989
Aharon Agranat, Victor Leyva, and Amnon Yariv, "Voltage-controlled photorefractive effect in paraelectric KTa1−xNbxO3:Cu, V," Opt. Lett. 14, 1017-1019 (1989)