Abstract

The holograms fixing process in very well known sillenite type photorefractive crystals Bi₁₂(Ge, Si, Ti)O₂₀ has important implications for various applications. An effect of prolonged memory of holographic recording with no applied electric field in photorefractive Bi₁₂TiO₂₀ (BTO) crystals at room temperature has been reported.^1,2 The effect is established for high frequency holographic grating with K = 2π/Λ ~ 3×10⁵ cm^-1, where Λ is the grating period.

© 1990 Optical Society of America