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在存在着预置时变空间电荷场的Cu :KNSBN晶体中 ,在实验中观察到一种弱光束扩散 收缩过程 ,此过程随光强的增大而迅速加快 .扩散 收缩过程是由晶体内预置时变电场以及弱光束本身产生的光伏和扩散空间电场在达到稳定之前共同影响所导致的结果 .
In the presence of a preset time-varying space charge field in Cu: KNSBN crystals, a weak beam diffusion-shrinkage process is observed in the experiment, which increases rapidly with the increase of light intensity.The diffusion-contraction process consists of intragranular pre- The time-varying electric field and the weak beam itself produce the electric field of the photovoltaic and diffusional space to jointly affect the result before they reach a stable condition.