[1] Bai Y S, Kachru R. Nonvolatile holographic storage with two-step recording in lithium niobate using cw Lasers[J]. Phys. Rev. Lett.1997,78(15):2944-2947.
[2] Adibi A, Buse K, Psaltis D. Two-center holographic recording[J]. J.Opt.Am.B,2001,18(5):584-601.
[3] Adibi A, Buse K, Psaltis D. Theoretical analysis of two-step holographic recording with high-intensity pulses[J]. Phys. Rev. A,2001,63(2):023813-1-023813-17.