We report the fixing of photorefractive holographic gratings with high efficiency in a sample of K1−yLiyTa1−xNbxO3 doped with Cu, V, and Ti. Holograms are thermally fixed through the screening of a photorefractive space-charge field by a nonphotoactive species at elevated temperatures. Fixed holograms are revealed by illumination at lower temperatures. Diffraction efficiencies of 25% in a 0.54-cm-thick sample are measured. Holograms undergo thermal decay with a 0.67-eV activation energy.
© 1995 Optical Society of America
Original Manuscript: December 23, 1994
Published: June 1, 1995
Victor Leyva, Doruk Engin, Aharon Agranat, Xiaolin Tong, Min Tong, and Amnon Yariv, "Fixing of photorefractive volume holograms in K1−yLiyTa1−xO3," Opt. Lett. 20, 1319-1321 (1995)