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采用非同时读出条件下的两波耦合实验装置,以单束光入射Ce∶KNSBN光折变晶体,系统研究了Ce∶KNSBN晶体中光扇效应随入射光偏振态、入射光强度、光入射角的变化情况。结果表明异常偏振光入射晶体时光扇效应明显,且存在明显的入射光强度阈值特性,入射光强度阈值为38.2mW/cm2;相同光入射角下,稳态光扇强度随入射光强度的增强而明显变大;对应相同的入射光强度,稳态光扇强度随光入射角θ的增大而增大,当θ为15°时到达峰值,而后随θ的增大而逐渐减小。同时对光扇效应的入射光强度阈值特性以及稳态光扇强度随入射光偏振态、入射光强度、光入射角的变化作出了相应的物理解释。
Using the two-wave coupling experimental apparatus under non-simultaneous readout conditions, single-beam incident Ce: KNSBN photorefractive crystal was used to systematically study the effect of the optical fan in the Ce: KNSBN crystal with the incident light polarization, incident light intensity, Changes in the angle. The results show that there is obvious optical fan effect when the extraordinary polarized light is incident on the crystal, and the threshold value of incident light intensity is obvious. The threshold value of incident light intensity is 38.2mW / cm2. Under the same light incident angle, the intensity of steady- The intensity of steady optical fiber increases with the increase of incident angle θ, and reaches the peak when θ is 15 °, then decreases with the increase of θ. At the same time, the threshold characteristics of incident light intensity of light fan and the intensity of steady light fan are explained correspondingly with the changes of incident light polarization, incident light intensity and light incident angle.