光强对(Cu,Ce)…LiNbO_3晶体非挥发性全息记录性质的影响

Effect of Intensity on Properties of Nonvolatile Holographic Recording in (Cu,Ce)…LiNbO_3 Crystal

实验研究了 (Cu ,Ce)…LiNbO3 晶体用蓝光敏化红光全息记录的光强对记录灵敏度和饱和衍射效率的影响。敏化光增加了记录灵敏度 ,足够高的光强将导致灵敏度的饱和行为。记录光以亚线性的关系Ixr(x <1)增大记录曲线 η1/ 2 t初始记录阶段的斜率 ,因而降低了记录灵敏度。

The effect of intensity on the recording sensitivity and saturation diffraction efficiency was studied experimentally in holographic recording of (Cu,Ce):LiNbO3 crystal by the use of a red beam for recording and a blue beam for sensitizing. The sensitizing light increases the recording sensitivity, and the saturation behavior would appear with enough high intensity of sensitizing light. The recording light increases the recording slope defined as the initial time derivative of the square root of the diffraction efficiency by sublinear relation Irx (X<1) and thus the recording light decreases the recording sensitivity. The dependence of saturation diffraction efficiency on the intensities of the recording and sensitizing light shows that there is a maximum saturation diffraction efficiency.