In this paper, Baoli Yao’s research team present a new scheme for parallel phase-shifting interferometry which employs a Michelson-like Michelson architecture and a simple polarization unit to generate two phase-shifting interferograms with phase shift of π/2 at a single camera exposure. The parallel phase-shifting unit is built with simple optical components, and the distance between the parallel interferograms can be adjusted conveniently. Phase reconstruction is performed by using a developed algorithm for two-step phase-shifting interferometry. The practicability of the proposed configuration and the reconstruction method is demonstrated by experiments.

（Original research article: Applied Optics 49(34):6612-6. https://doi.org/10.1364/AO.49.006612 ）