【摘要】 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 .更多还原

【Abstract】 We have observed that a weak light beam will experience a defocusing\|contract process before it comes to steady state when passing through a Cu:KNSBN crystal with a transient spatial electric field. This process became fast by increasing intensity of the light beam. We believe that the defocusing\|contract process results from both effects of the transient electric field in the crystals and the photovoltaic and refocusing fields generated by the beam itself.更多还原