BaTiO_3∶Ce自泵浦相位共轭产生机制随入射位置和角度的变化

MECHANISM TRANSFORMATION WITH PUMP BEAM INCIDENT ANGLE AND POSITION OF SELF PUMPED PHASE CONJUGATION IN BaTiO 3∶Ce

实验发现在保持入射到晶体表面的泵浦光斑尺寸不变的条件下，随泵浦光的入射位置和入射角不同，自泵浦相位共轭形成机制在ＦＷＭ－ＴＩＲ、ＦＷＭ－ＳＰＢ和ＦＷＭ－ＴＩＲ与ＦＷＭ－ＳＰＢ之间转变．

It is reported the fist observation of mechanism transformation with pump beam incident angle and position of self pumped phase conjugation (SPPC) in BaTiO 3∶Ce crystal in the green,λ=514.5nm.It was found that the SPPC mechanism changed from a “cat”(FWM TIM) mechanism to a stimulated photorefractive backscattering and four wave mixing (FWM SPB) when the pump beam incident angle and position were varied,with a transition of FWM TIR and FWM SPB mechanism coexist.