聚合物弥散液晶材料在1550nm的电光特性研究

实验研究了不同配方及工艺条件下，聚合物弥散液晶（PDLC）材料在1550nm处的电控光透射特性。由此筛选合适的配方和工艺，研制了聚合物弥散液晶电控可调光衰减器样品。实验说明，在1550nm工作点，50％左右合适的液晶含量的聚合物弥散液晶样品能够获得更好的电控光学性能。采用配方质量比ω（DHPA）：ω（E7）：ω（RB）：ω（NVP）：ω（NPG）=100：100：3：2：1．5的配方，制作在1550nm工作的聚合物弥散液晶光衰减器样品。经检测，输入光源为1550mm，223μW时，器件插入损耗为2．3dB，衰减调节范围为13dB，线性工作区域为20～70V。

The Study of Electrooptical Characteristics of Polymer Dispersed Liquid Crystal at 1550 nm

Some experiments have been performed to research the electrooptical characteristics of polymer dispersed liquid crystal (PDLC) with different recipes and preparation techniques at 1550 nm. Results of the research show that the liquid crystal content and surfactant impact the electrooptical characteristics PDLC greatly, and with about 50% LC content, relatively better electrooptical curves may be obtained at 1550 nm. Base on these experiments, some comparatively suitable recipes and preparation techniques are selected to manufacture PDLC tunable attenuator samples. As a result, recipe with the mass ratio as w(DHPA)∶w(E7)∶w(RB)∶w(NVP)∶w(NPG)＝100∶100∶3∶2∶1.5 is adopted and fabricated the PDLC optical tunable attenuator samples. The average insertion loss is 2.3 dB at the wavelength of 1550 nm with the output power 223 μW, and the attenuation range is about 13 dB, voltage linear working range of the device is from 20 V to 70 V.