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A cyclic scheme of a recording period with a red interference pattern and an ultraviolet (UV) light and a following post-exposure period with an UV light is suggested to accumulate nonvolatile photorefractive holograms in LiNbO 3 :Fe:Mn with enhanced diffraction efficiency and suppressed scattering noise. Experimental results as well as an enhancement of diffraction efficiency up to 30% and...
Nonvolatile photorefractive gratings have been recorded in LiNbO 3 :Cu:Ce crystals by using a He-Ne laser (633 nm) for recording and an argon ion laser (458 nm) for sensitizing. The sensitizing light increases the recording sensitivity by a-bexp(-I s /c) and saturation behavior will appear with high enough intensity of sensitizing light. The recording light increases the slope of η...
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