Phase shifts of light in the orders of diffraction gratings for the interference sensor of linear displacements are considered. The use of a phase diffraction grating with given geometrical parameters of the surface relief makes it possible to stabilize the phase relationships in the optical signals and, as a result, in the final signals taken from the displacement sensor. Based on mathematical modeling data, technically feasible parameters of the surface relief of diffraction gratings are proposed to create the required phase shifts between the diffracted beams and quadrature modulation signals and to achieve the required measurement accuracy with nanometric resolution.
The article describes the recording of multiplex Bragg diffraction gratings for optical lightguide displays using an optical replication method with a phase mask. The lightguides in the experiment were made of photo-thermo-refractive glass. A photoresist relief-phase diffraction grating was used as a phase mask. Based on angle multiplexing, a compact augmented reality display was implemented.
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