Multi-level phase encoding 2D signal is very important in the application of holographic data storage. However, conventional phase-shifting interferometry using addition reference beam suffers from the fluctuation in the phase stability, the phase-shifting, and the wavefront error of the reference beam. This paper proposes and demonstrates a pre-integral DFGSI with the utilization of a built-in phase-shifting function, to retrieve multi-level phase signals. This type of new interferometer will be helpful in optical testing in dynamic circumstances with a common path and without an additional reference wave.
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