Method and apparatus for preparing PVG by generating vector light field on basis of spatial light modulators

WO2026027003A3PCT designated stage Publication Date: 2026-03-26SOUTHEAST UNIV +1
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Filing Date
2025-10-14
Publication Date
2026-03-26

AI Technical Summary

Technical Problem

Traditional methods for producing high-precision holograms are limited by equipment size and environmental sensitivity, resulting in poor stability and consistency, and making it difficult to achieve efficient preparation of large-format holograms.

Method used

By employing an electronically controlled phase element SLM and a single-beam exposure system, and through the orientation control of azo dye liquid crystal molecules combined with the phase modulation of SLM1 and SLM2, a periodically rotating vector light field is generated to fabricate a polarizing holographic grating with high uniformity and stability.

Benefits of technology

It improves the stability and consistency of hologram fabrication, simplifies optical path configuration, reduces sensitivity to environmental vibrations, and enhances the flexibility and precision of the fabrication process, making it suitable for industrial production.

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Abstract

A method and apparatus for preparing a polarization volume grating (PVG) by generating a vector light field on the basis of spatial light modulators (SLMs). The apparatus comprises an illumination system, a phase design system and an exposure system, wherein the illumination system mainly comprises a laser and a beam expander assembled together; the phase design system is composed of spatial light modulator I and spatial light modulator II. The illumination system and the spatial light modulator I are aligned along a central axis, while the spatial light modulator II and an exposure imaging system operate along a vertical central axis. The present invention improves the flexibility of manufacturing a polarization volume grating; by using programmable electronically controlled spatial light modulators, to perform phase modulation to control a lateral period, experimental errors caused by manual adjustment of mirrors in traditional methods are reduced; moreover, different from traditional interference exposure methods, the entire system exhibits relatively high robustness; in addition, compared with a separated interference optical path, the use of a single beam expander avoids the problem of beam consistency during beam expansion.
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