Holographic image storage in Eu3+-doped alkali aluminosilicate glasses

We demonstrate that holographic information can be stored in Eu3+-doped alk ali aluminosilicate glasses. The holograms were developed by a two-beam mix ing configuration with a write-beam wavelength (465.8 nm) corresponding to the F-7(0) --> D-5(0) transition of the Eu3+ ions. The images were reconstr ucted either with the wavelength used to record them or with wavelengths be low this transition(543.5 and 632.8 nm). We stored clear holographic images using a total writing power of 5 mW and an exposure time of 20 s.. In addi tion, clear holograms were recorded with an exposure time of 200 ms when 10 0 mW of the writing power was used. The exposure time and the writing power required to obtain clear holographic images are dependent on the Eu3+ conc entration. (C) 2001 Optical Society of America.