Multimode liquid crystal blazed grating

Abstract

The utility model discloses a kind of multi-mode liquid crystal blazed grating, can be electrically controlled switching among negative first-order blazed, positive first-order blazed and sinusoidal grating three modes.The grating includes glass substrate, orientation layer, liquid crystal layer and driving electrode layer.Driving electrode layer includes two groups of strip electrodes: first stripe electrode (I and II) periodical arrangement, voltage V1 and-V1 are respectively applied;Second stripe electrode (I and II) periodical arrangement, V2 and V2 are respectively applied.Voltage polarity is realized mode switching by regulation and control: when V1, V2>0 and V1>V2, form asymmetric electric field, produce negative first-order blazed grating;When V1>0, V2<0, electric field flips, generates positive first-order blazed grating;When V2=0, V1≠0, form symmetric electric field, output sinusoidal grating.The device structure is simple, preparation is convenient, with light, fast response, switching convenient advantage, applicable to non-mechanical beam steering system.

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