By. Zeldovich et Pn. Ilinykh, RECORDING OF A TRAVELING INTERFERENCE PAT TERN BY A 2-FREQUENCY FIELDIN A CRYSTAL, Kvantovaa elektronika, 22(7), 1995, pp. 749-750
Theoretical and experimental investigations were made of hologram reco
rding in a photorefractive Bi12TiO20 crystal. The application of an el
ectric field of the E(t) = E(1) cos Omega(1)t + E(2) cos Omega 2t type
makes it possible to record an interference pattern travelling at a v
elocity v = (Omega(1)+/-Omega(2))/q.