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    • 53. 发明授权
    • Dual-polarization liquid-crystal etalon filter
    • 双极化液晶标准器滤波器
    • US5111321A
    • 1992-05-05
    • US677769
    • 1991-03-29
    • Jayantilal S. Patel
    • Jayantilal S. Patel
    • G02F1/139G02F1/21H04B10/135
    • H04B10/25G02F1/216G02F1/139G02F2001/213G02F2203/055G02F2203/06
    • A tunable dual-polarization liquid-crystal etalon filter, in which a Fabry-Perot cavity is set up between two end reflectors, preferably interference mirrors. A nematic liquid crystal fills a substantial portion of the Fabry-Perot cavity. The alignment layer adjacent to one end of the cavity is dividend into two portions, both of which are homogeneous but which are buffed in orthogonal directions so that they align the liquid crystal parallel to their surfaces but at orthogonal directions to each other. The other alignment layer is homeotropic so that it aligns the liquid crystal perpendicularly to its surface. Electrodes incorporated with each mirror apply a voltage across the liquid crystal so as to change the dielectric constant and thus the effective cavity length for radiation polarized along the alignment direction of the respective homogeneous portion. Because of the orthogonal buffing of the two homogeneous portions, they operate in equal amounts upon the two orthogonal polarizations. An input beam is divided between the two homogeneous portions. Preferably, both substrates upon which the filter is built are birefringent, e.g., calcite, so as to act as a polarization beam splitter and a recombiner.
    • 可调谐双极化液晶标准具滤光器,其中法布里 - 珀罗腔体设置在两个端部反射器之间,优选地是干涉镜。 向列型液晶填充了法布里 - 珀罗腔的大部分。 与空腔的一端相邻的取向层被分成两部分,两部分是均匀的,但是在正交方向上被抛光,使得它们使液晶平行于它们的表面但彼此正交的方向对齐。 另一个取向层是垂直的,使得液晶垂直于其表面。 与每个镜子结合的电极在液晶两端施加电压,以便改变介电常数,从而改变沿着各个均匀部分的排列方向偏振的辐射的有效腔长度。 由于两个均匀部分的正交抛光,它们在两个正交偏振上的作用相等。 输入光束在两个均匀部分之间划分。 优选地,其上构建过滤器的两个基板都是双折射的,例如方解石,以便用作偏振分束器和重组器。