申请人:Rolic AG
公开号:US06143208A1
公开(公告)日:2000-11-07
An optical frequency conversion element has a wave-guiding layer which consists of a .chi..sup.(2) -active ferroelectric liquid crystal. The monomeric or polymeric liquid crystal material has a periodic structure which permits the so-called quasi phase matching of a guided laser beam. The period length of the structure is equal to twice the coherence length l.sub.c =.pi./.DELTA..beta. of the material, whereby .DELTA..beta.=.beta..sub.o (2.omega.)-2.beta..sub.o (.omega.), with .omega.=angular frequency of the fundamental wave, 0=zero-order mode and .beta.=propagation constant of the mode.
一个光频率转换元件具有一个波导层,该波导层由一个.chi..sup.(2) -活性铁电液晶组成。单体或聚合物液晶材料具有允许所谓的引导激光束的准相位匹配的周期结构。结构的周期长度等于材料的相干长度l.sub.c的两倍,其中.DELTA..beta.=.beta..sub.o (2.omega.)-2.beta..sub.o (.omega.),其中.omega.=基波的角频率,0=零阶模,.beta.=模式的传播常数。