Generalized phase-shifting real-time holography based on photorefractive crystals

摘要

This report proposes a method for measuring object phase changes in real time. This new method utilises photorefractive holographic interferometry to form a hologram that contains an object phase variation and extracts this phase variation using a fringe analysis method involving two-step generalized phase-shifting interferometry. Compared to traditional methods, instead of using four holograms to achieve phase reconstruction, only two holograms are needed to record the proposed algorithm, and this approach is immune to phase-shifting errors arising from various sources. This algorithm may be useful for designing a detecting system for the real-time measurement of object variations.