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Double aperture common-path phase-shifting interferometry by translating a ruling at the input plane.

Cruz Meneses-Fabian¹, Rosaura Kantun-Montiel, Gildardo-Pablo Lemus-Alonso

¹Facultad de CienciasFisico-Matematicas, Benemerita Universidad Autonoma de Puebla, Av. San Claudio y 18 Sur, CU San Manuel, Apdo 165, Puebla 72000, Mexico. cmeneses@fcfm.buap.mx

|June 1, 2013

Summary

This study introduces a novel method for generating phase steps in interferograms using a common-path interferometer. The technique enhances phase step resolution by translating a ruling within a 4f optical system.

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Area of Science:

Optical interferometry
Phase metrology
Diffraction optics

Background:

Interferometry is crucial for precise measurements.
Common-path interferometers offer stability advantages.
Generating controlled phase steps is essential for advanced interferometric techniques.

Purpose of the Study:

To present a new method for introducing phase steps in interferograms.
To improve the resolution of phase steps in interferometric measurements.
To demonstrate the efficacy of the proposed method through theoretical modeling and experimental validation.

Main Methods:

Utilizing a double aperture common-path interferometer with a 4f optical system.
Employing Ronchi rulings at the input and Fourier planes.
Filtering a single diffraction order in the Fourier plane to generate phase steps via translation.

Main Results:

Successfully generated phase steps by translating an input plane ruling.
Demonstrated improved resolution in the generated phase steps.
Validated the theoretical model with experimental results.

Conclusions:

The proposed method effectively introduces phase steps in interferograms.
The technique offers enhanced resolution for phase metrology applications.
This approach provides a viable alternative for precise phase step generation in interferometry.