Optical properties of organic photorefractive polymers for phase retrieval and filtering
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摘要: 采用后重氮偶合法，合成了一种新型含咔唑类聚磷腈有机光折变材料。采用氢谱核磁共振法，红外光谱法，紫外-可见吸收光谱法，热重法和差示扫描量热法对该聚合物进行表征和分析，结果表明，该聚合物具有良好的热稳定性，在230 ℃开始分解，450 ℃时基本分解完全。UV-Vis表明波长在360 nm与570 nm之间的宽的吸收带是由于共轭长度的增加产生的，因此可以调整参加偶合反应的重氮盐比例，来控制偶氮生色团功能组分的接入含量。在未使用外加电场及事先极化的条件下对聚合物进行了二波耦合与四波混频实验，证明了聚合物的光折变特性。得到聚合物P-2和P-3的二波耦合增益系数分别为38 cm-1和53.6 cm-1，聚合物P-2和P-3的四波混频衍射效率分别为2.7%和8.1%。Abstract: New polyphosphazene organic photorefractive materials with carbazole groups were synthesized by diazo-coupling reaction. They were characterized by 1H Nuclear magnetic resonance，infrared spectrum，Ultra-violet-visible，thermogravimetry and differential scanning calorimetry. The result showed that polymers had good heating stability. They started to decompose at 230 ℃ and decomposed completely at 450 ℃. UV-Vis indicated that the broad absorption peak ranging from 360 to 570 nm was derived from the increase in the conjugation length. Hence we can adjust the ratio of diazonium salt in the coupling reaction to control the access content of azo chromophore functional component. The photorefractive effects were investigated without electric field and polarization by two-beam coupling (2BC) and degenerated four-wave mixing(DFWM).The coupling coefficients of polymers P-2 and P-3 are measured to be about 38 cm-1 and 53.6 cm-1 respectively and the diffraction efficiencies of polymers P-2 and P-3 are measured to be about 2.7% and 8.1% respectively.
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