Holograms have been recorded in congruent LiTaO<sub>3</sub>:Fe with continuous-wave laser light by use of a two-step process. Blue gating light (λ=488 nm) sensitizes the crystals for holographic recording with red light (λ=660 nm) of a diode laser. Refractive-index changes of as much as 1.0×10<sup>-5</sup> are achieved for intensities of the red light of 1 W/cm<sup>2</sup> . The saturation values are proportional to the intensity of the writing light. Nondestructive readout with red light is possible, and the holograms remain erasable for blue light.
© 1999 Optical Society of America
(090.2900) Holography : Optical storage materials
(160.5320) Materials : Photorefractive materials
(210.2860) Optical data storage : Holographic and volume memories
(210.4810) Optical data storage : Optical storage-recording materials
J. Imbrock, D. Kip, and E. Krätzig, "Nonvolatile holographic storage in iron-doped lithium tantalate with continuous-wave laser light," Opt. Lett. 24, 1302-1304 (1999)