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Updated: Oct 12, 2025

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
Published on: January 28, 2019
Phase unwrapping using the extracted degree of coherence and phase from phase shifting interferometry systems
Abstract:
Current phase unwrapping methods for non-scanning interferometry systems with one wavelength are not robust in the presence of high steps while still having a limited step height and range using two wavelengths configurations. Here, a new phase unwrapping method is proposed, allowing imaging steps with a height up to 15 times the wavelength using one wavelength or up to 1500 times using two wavelengths. It is based on a one-time computational model fitting of calibration measurements that allows to extract the degree of coherence and phase from two phase-shifted images per wavelength, perform phase unwrapping and accurately reconstruct the 3D structure of the sample. The proposed method has a nanometric axial accuracy and can operate in real-time. The algorithms and methodology for one and two wavelengths are presented and confirmed experimentally.
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