COMPACT LIQUID CRYSTAL BEAM STEERING DEVICES INCLUDING MULTIPLE POLARIZATION GRATINGS

摘要

Systems, methods, and apparatus are disclosed for attenuating an incident polarized light beam using a plurality of LCPGs and one or more switchable liquid crystal layers. When four LCPGs are used, a spacing between first and second LCPGs can be equal to a spacing between third and fourth LCPGs. Pi and FCL cells can also be used in place of more traditional LC switches. Switching of the LC switch can be imparted via an AC bias.