【摘要】 用干涉法在自散焦光折变晶体LiNbO3:Fe中写入光子晶格的动态过程中,发现了双光束干涉条纹一分为二,四光束干涉点阵一分为四的分裂现象.研究证明:这是干涉条纹空间频率的倍频现象,是入射的干涉光场与写入的光子晶格之间相互作用的结果.本实验说明利用光折变效应可以容易地实现干涉光场空间频率的倍频和空间高次谐波的产生,并可利用产生的空间谐波感应出二倍频和高倍频的光折变光子晶格.更多还原

【Abstract】 Using interference method fabricate photonic lattices in self-defocus photorefractive crystal LNbO₃:Fe.We had find the phenomenons that dual-beam interference fringe one divides into two,four-beam interference fringe one divides into four.We had proved it is a kind of phenomena of spacial frequency-doubling,this kind of phenomenon is the result of the interaction between the interfere field and the interfere field fabricative photonic lattices.This experiment had showed that spacial second-harmonic generation and high-order harmonics generation can be easy achieved by photorefractive effect crystal,that second-harmonic can fabricate spacial frequency-doubling photonic lattices,that high-order harmonics can fabricate spacial frequency-high photonic lattices.更多还原