Abstract
Photorefractive (PR) crystals such as BaTiO3, KNbO3, LiNbO3, and SBN are very promising for all-optical signal processing.1 With the availability of diode lasers operating at near-infrared wavelengths, attention has been drawn to the possibility of extending the crystal response up to communication wavelengths. Near-infrared photorefractive response was reported in Rh-doped BaTiO3 crystals between 720 and 1004 nm.2 Cu-and Ni-doped KNbO3 bulk crystals show photorefractive sensitivity up to 860 nm3 and Fe-doped KNbO3 ion-implanted waveguides exhibit quite large photorefractive gain at 830 nm.4
© 1996 Optical Society of America
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