科研之友
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摘要
Based on two-center model, multiplexing of nonvolatile holograms with equal-time exposure in LiNbO3:Fe:Cu crystals was simulated by using Runge-Kutta method, and the physical mechanism of equal-time multiplexing was analyzed. Considering both the mechanisms of optical erasure and varied diffraction efficiency, equal exposure time can compensate for the gradual decrease of sensitivity when recording latter-recorded holograms and holograms with nearly equal diffraction efficiencies can be achieved. The optimization of multiplexing holograms with higher diffraction efficiency was discussed, when intensity ratio of red beams to UV beam I-R/I-UV is about 15, the maximum of the average diffraction efficiency can be obtained.
