It is demonstrated that Er doping increases the photorefractive effect in LiTaO<sub>3</sub>. Raman and fluorescence spectra are used to establish that the upconverted green emission of Er<sup>3+</sup> clusters acts as a gating source, significantly increasing the two-photon photorefractive effect of a monochromatic red or near-infrared pump source.
© 2000 Optical Society of America
(130.3130) Integrated optics : Integrated optics materials
(140.3380) Lasers and laser optics : Laser materials
(140.3500) Lasers and laser optics : Lasers, erbium
(210.4810) Optical data storage : Optical storage-recording materials
(230.3120) Optical devices : Integrated optics devices
Sergey M. Kostritskii, David B. Maring, Robert F. Tavlykaev, and Ramu V. Ramaswamy, "Self-Gated Two-Photon Photorefractive Effect Induced by Light Upconversion In Er-Doped LiTaO 3," Appl. Opt. 39, 4292-4295 (2000)