This paper experimentally investigates the dynamic characteristics of electrically controlled modulators based on liquid crystals (LCs) in the visible and near-IR regions and the effect of the electric-field parameters on them, along with the variation of the conditions of the interphase interaction of the LCs with the orienting surface. It is shown that it is effective to use a dual-frequency liquid crystal for phase and amplitude modulation of radiation with wavelength 1.55 mu m. In an LC modulator operating on the S effect, a 2 pi phase lag is obtained in a time of 2 ms. The switching times can be reduced to the microsecond range when the twist effect is used and the LC layer is about 7 mu m thick by increasing the voltage from 30 to 50 V. (c) 2008 Optical Society of America.
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机译：本文通过实验研究了基于液晶（LCs）的电控调制器在可见光和近红外区域的动态特性及其电场参数对其的影响，以及液相调制器与取向表面相间相互作用条件的变化。结果表明，使用双频液晶对波长为1.55 μ m的辐射进行相位和幅度调制是有效的。在以 S 效应工作 LC 调制器中，可在 2 ms 的时间内获得 2 pi 相位滞后。当使用扭曲效应时，通过将电压从 30 V 增加到 50 V，LC 层的厚度约为 7 μm 时，开关时间可以减少到微秒范围。 （c） 2008 年美国光学学会。
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