4 January 1990 Recording Of Frequency-Difference Holograms In Lithium Niobate
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The stabilization of volume phase holograms against erasure during read-out is of fundamental importance for the storage of volume phase holograms. There are several proposals to avoid the erasure of a hologram when reading it. In this paper we shall especially be concerned with the method of frequency-difference holograms. The basic idea is to record a hologram of the same object with two different frequencies and to read out with the difference of the frequencies. First we shall discuss light diffraction by frequency-difference holograms in terms of virtual holograms not physically present in the crystal. Since the efficiencies of the two-step processes involved turn out to be much too small compared to experimental data a refined mechanism which allows the formation of real frequency-difference holograms is outlined. The theory is based on off-Bragg terms in Maxwell's equations and is able to explain the order of magnitude of the experimental data.
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S. Fries, J. Otten, K. H. Ringhofer, R. A. Rupp, "Recording Of Frequency-Difference Holograms In Lithium Niobate", Proc. SPIE 1148, Nonlinear Optical Properties of Materials, (4 January 1990); doi: 10.1117/12.962141; https://doi.org/10.1117/12.962141

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