Compact liquid crystal beam steering devices including multiple polarization gratings
US10509296B2 · kind B2 · utility
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18Claims
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Key dates
| Filing date | Jul 20, 2017 |
| Grant date | Dec 17, 2019 |
| Priority date | — |
| Expiry date | Aug 3, 2037 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B27/4277
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Systems, methods, and apparatus are disclosed for attenuating an incident polarized light beam using a plurality of Liquid Crystal Polarization Gratings (“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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.