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首页> 外文期刊>Journal of optics, A. Pure and applied optics: journal of the European Optical Society >A polarization-independent and low scattering transmission grating for a distributed feedback cavity based on holographic polymer dispersed liquid crystal
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A polarization-independent and low scattering transmission grating for a distributed feedback cavity based on holographic polymer dispersed liquid crystal

机译：基于全息聚合物分散液晶的分布式反馈腔偏振无关低散射透射光栅

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摘要

By using acrylate monomers and increasing the fabricating temperature to the nematic-isotropic transition point of liquid crystal, a polarization- independent holographic polymer dispersed liquid crystal (HPDLC) transmission grating is demonstrated, which is different from the conventional anisotropic grating forms at room temperature. Also, about 25% more liquid crystal is phase separated out to form the pure liquid crystal layer and the scattering loss of the Bragg diffraction grating is reduced from 8% to 4%. These results are explained by means of optical measurements. The randomly aligned liquid crystal (LC) molecules in the pure LC layer of the transmission grating bring in a much higher refractive index contrast for photons of specific frequency propagating along the grating vector, which results in a much more effective light feedback effect. Experimental results of this transmission grating as a distributed feedback laser show a lasing output with a full width at half maximum (FWHM) of about only 0.6nm and a threshold of 6νJ/pulse.
机译：通过使用丙烯酸酯单体并提高制造温度至液晶的向列各向同性转变点，证明了偏振独立的全息聚合物分散液晶（HPDLC）透射光栅，这与室温下常规的各向异性光栅形式不同。另外，相分离出约25％以上的液晶以形成纯液晶层，并且布拉格衍射光栅的散射损耗从8％减小到4％。这些结果通过光学测量来解释。透射光栅的纯LC层中的随机排列的液晶（LC）分子为沿光栅矢量传播的特定频率的光子带来更高的折射率对比度，从而产生更有效的光反馈效果。这种透射光栅作为分布式反馈激光器的实验结果显示，其半峰全宽（FWHM）的激光输出仅为0.6nm，阈值为6νJ/脉冲。

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