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Updated: Feb 20, 2026

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
Published on: January 28, 2019
Self-calibrating phase-shifting interferometry of three unequal phase steps by fitting background light to a
Abstract:
This paper presents a novel non-iterative and robust algorithm in phase-shifting interferometry of three unknown and unequal phase steps. First, the modulation light and the object phase are algebraically eliminated; second, the background light is approximated to a 2-D polynomial of degree K and estimated by applying the least squares method; third the phase steps are obtained, and finally, the object phase is computed. This idea is theoretically described and verified numerically and experimentally for several values of K.
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