A liquid crystal phase grating, suitable for instrumentation applications has been developed that utilizes refractive index matching to enable it to be switched from a diffracting to a non-diffracting state by application of an electric field. The effect of the non-uniform molecular alignment during switching is considered and compared with measured data for such a device. The observed switching potentially offers a device in which the mark/space ratio may be varied with the applied electric field. [References: 8]
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