【摘要】 作为一种有可能作为永久信息存储的材料,合成出一种新的双偶氮材料(BA1)。当样品被波长为532nm的光激发时,几乎大部分BA1分子从反-反态转化到顺-顺态,产生了光致双折射。因此,研究了BA1分子掺杂的PMMA薄膜的光致双折射和透过信号与入射光强度的关系。实验结果表明:透过信号强度随着泵浦光的增强而增强。通过偏振态互相平行(SS)和垂直(SP)的两束偏振光用来研究偏振全息存储,结果表明SP光栅形成的衍射信号要比SS光栅的衍射信号强很多。更多还原

【Abstract】 A new kind of bisazo(BA1) was synthesized as a material candidate for perpetual information storage application. When the sample was pumped by the beam of 532 nm, almost half of the BA1 molecules undergo a reversible trans-trans to cis-cis isomerization in the polymer matrix, resulting in photo-induced birefringence. Hence, the dependences of photo-induced birefringence and the transmission signals on the pumping beam intensities in BA1 doped poly (methyl methacrylate) (PMMA) film were studied. It is shown that transmission signals increase with the enhancement of pump beam intensities. Here the two linear polarized beams with parallel state (SS) and orthogonal state (SP) were used to investigate holographic storage. It can be clearly seen that the diffraction efficiency of SP grating much higher than that of SS configuration.更多还原