Abstract

There are two techniques of nonstationary holographic recording which are widely used for PRCs with long drift lengths of photocarriers. These are recording of a moving interference pattern in an external DC electric field [1] and recording of a fixed pattern in an AC field [21. Both of them allow the efficiency of the drift mechanism of recording in the external electric field to be increased and the recorded hologram to be transformed into a shifted one. The theory [3] predicts equal efficiencies of two-wave energy exchange for these two techniques. In practice, the "moving grating" technique is traditionally employed for Bi₁₂SiO₂₀ (BSO), but for Bi₁₂TiO₂₀ (BTO), recording in an AC field is in common use. Recent investigations of holographic recording in semi-insulating GaAs:Cr (λ=1.06 μm) [4,5] have demonstrated remarkable superiority of the moving grating mechanism.

© 1991 Optical Society of America