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实验发现在 Ce:(K0 .5Na0 .5) 0 .2 (Sr0 .6 1Ba0 .39) 0 .9Nb2 O6 (Ce:KNSBN)光折变晶体的同一点记录两幅光栅时 ,其中一幅光栅的衍射效率 (η)相对于两光束夹角 (2θ)的关系曲线峰值位置由仅存储一幅光栅时的 3 6°变为 44°.采用跳跃模型的微扰分析方法解释了这一现象 .
It has been found experimentally that when one grating is recorded at the same point of Ce: (K0.5Na0.5) 0.2 (Sr0.6Ba0.39) 0.9Nb2O6 (Ce: KNSBN) photorefractive crystal, The peak position of the diffraction efficiency (η) with respect to the angle between the two beams (2θ) is changed from 36 ° to 44 ° when only one grating is stored. This phenomenon is explained by the perturbation analysis method using a jump model.