Comment on "Dual-wavelength in-line phase-shifting interferometry based on two dc-term-suppressed intensities with a special phase shift for quantitative phase extraction"

TL;DR

This paper critiques a dual-wavelength interferometry method, proposing an alternative approach that simplifies practical implementation while maintaining accuracy and speed, using generalized phase-shifting and least-square algorithms.

Contribution

It introduces a new method combining generalized phase-shifting and least-square algorithms, removing the need for special phase shifts in dual-wavelength interferometry.

Findings

Maintains high accuracy in phase extraction.

Allows random phase shift selection.

Facilitates practical measurement applications.

Abstract

We comment on the recent Letter by Xu and Wang et al. [Opt. Lett. 41, 2430 (2016)] in which an approach of quantitative phase extraction in dual-wavelength in-line phase-shifting interferometry (DWILPSI) was proposed. It is noted that a special phase shift is used, which more or less embarrasses its practical operation. We wish to show that the same result can also be reached by combining the generalized phase-shifting algorithm and the least-square algorithm, in which the phase shift can be chosen randomly. In addition to maintaining high accuracy and rapid processing speed of the DWILPSI method, the proposed method greatly facilitates its application in actual measurement.