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Related Experiment Video

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Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator

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Single-wavelength phase retrieval method from simultaneous multi-wavelength in-line phase-shifting interferograms.

Leihuan Fei, Xiaoxu Lu, Haling Wang

|January 22, 2015

Summary

A new method retrieves phase information from simultaneous multi-wavelength phase-shifting interferograms (SMWPSIs) using a least-squares iterative algorithm. This simplifies optical setups and reduces data requirements for dual-wavelength interferometry.

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Area of Science:

Optical Metrology
Interferometry

Background:

Traditional multi-wavelength interferometry often requires complex setups and significant data acquisition.
Accurate phase retrieval is crucial for precise measurements in optical metrology.

Purpose of the Study:

To develop a novel single-wavelength phase retrieval method for dual-wavelength interferometry.
To simplify the optical setup and reduce data acquisition requirements compared to existing methods.

Main Methods:

Utilizing simultaneous multi-wavelength phase-shifting interferograms (SMWPSIs).
Applying a least-squares iterative algorithm for phase retrieval from each single wavelength.
Calculating the synthetic wavelength phase by subtraction.

Main Results:

Demonstrated simpler optical setups through simulations and experiments.
Showed reduced requirements for phase-shifting device displacement and interferogram count.
Successfully retrieved wrapped phases and phase-shifts even when phase-shifts were unknown.

Conclusions:

The proposed method offers a more efficient and simpler approach to dual-wavelength interferometry.
This technique enhances phase retrieval accuracy and reduces experimental complexity.
It provides a robust solution for phase measurement, even with unknown phase-shifts.