Chinese Optics Letters, 2009, 7 (1): 0167, Published Online: Mar. 4, 2009
Nonvolatile two-color holographic recording in near-stoichiometric lithium niobate crystals gated by incoherent ultraviolet light
铌酸锂 热处理 全息存储 非挥发 210.2860 Holographic and volume memories 090.2900 Optical storage materials 160.2900 Optical storage materials 160.5320 Photorefractive materials
Abstract
2 Nonvolatile two-color holographic recording gated by incoherent ultraviolet (UV) light centered at 365 nm is investigated in near-stoichiometric lithium niobate crystals. The influence of thermal treatment on the two-color recording is studied. The results show that thermal reduction tends to improve the two-color recording performance, whereas thermal oxidation degrades the two-color recording. With an incoherent 0.2-W/cm2 UV gating light and a 0.25-W/cm2 semiconductor recording laser at 780 nm, a two-color recording sensitivity of 4\times10^{-3} cm/J and a recording dynamic range characterized by M/# of 0.12 are achieved in a 2.2-mm thermally reduced near-stoichiometric lithium niobate crystal. We attribute the improvement to the prolonged lifetime of small polarons and the increased absorption at the gating wavelength due to thermal reduction.
Shaolin Chen, Xiangming Liu, Bo Fu, Guoquan Zhang. Nonvolatile two-color holographic recording in near-stoichiometric lithium niobate crystals gated by incoherent ultraviolet light[J]. Chinese Optics Letters, 2009, 7(1): 0167.