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A photorefractive organically modified silica glass with high optical gain

机译：具有高光学增益的光折变有机改性石英玻璃

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Photorefractive materials exhibit a spatial modulation of the refractive index due to redistribution of photogenerated charges in an optically nonlinear medium. As such, they have the ability to manipulate light and are potentially important for optical applications including image processing, optical storage, programmable optical interconnects and simulation of neural networks. Photorefractive materials are generally crystals, polymers and glasses with electro-optic or birefringent properties and non-centrosymmetric structure. Here we report the photorefractive effect in both non-centrosymmetric and centrosymmetric azo-dye-doped silica glasses, in which refractive index gratings that are spatially phase-shifted with respect to the incident light intensity pattern are observed. The effect results from a nonlocal response of the material to optical illumination, and enables the transfer of energy between two interfering light beams (asymmetric two-beam coupling). Although the writing time for the present grating is relatively slow, we have achieved a two-beam coupling optical gain of 188 cm~(-1) in the centrosymmetric glasses, and a gain of 444 cm~(-1) in the non-centrosymmetric structures. The latter are fabricated using a corona discharge process to induce a permanent arrangement of azo-dye chromophores.
机译：由于光产生的电荷在光学非线性介质中的重新分布，光折射材料表现出折射率的空间调制。因此，它们具有操纵光的能力，对于光学应用（包括图像处理，光学存储，可编程光学互连和神经网络仿真）可能具有重要意义。光折射材料通常是具有电光或双折射特性和非中心对称结构的晶体，聚合物和玻璃。在这里，我们报道了在非中心对称和中心对称的偶氮染料掺杂石英玻璃中的光折射效应，其中观察到相对于入射光强度图案在空间上相移的折射率光栅。这种影响是由于材料对光学照明的非局部响应而引起的，并且使能量能够在两个干涉光束之间传递（非对称两光束耦合）。尽管目前光栅的写入时间相对较慢，但我们在中心对称眼镜中实现了双光束耦合光学增益为188 cm〜（-1），在非对称眼镜中实现了444 cm〜（-1）。中心对称结构。后者使用电晕放电工艺制造，以诱导偶氮染料生色团的永久排列。

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