We describe the use of two-photon absorption in a photorefractive crystal for recording bit data in multilayered optical memory. A short-pulse near-infrared laser is used for generating the photorefractive effect by two-photon absorption. We succeeded in recording and reading seven layers of data in a LiNbO<sub>3</sub> crystal with a lateral resolution (distance between bits) of 5µm and an axial resolution (distance between layers) of 20 µm .
© 1998 Optical Society of America
Yoshimasa Kawata, Hidekazu Ishitobi, and Satoshi Kawata, "Use of two-photon absorption in a photorefractive crystal for three-dimensional optical memory," Opt. Lett. 23, 756-758 (1998)