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A novel multiple directional shearing interferometry system with synchronous polarization phase shifting.

Yahui Zhu¹, Ailing Tian², Hongjun Wang²

¹School of Computer Science and Technology, Huaiyin Normal University, Huaian, 223300, Jiangsu, China. zyhxhu@163.com.

Scientific Reports

|January 22, 2025

Summary

A novel interferometer uses multi-directional shearing and polarization phase-shifting to accurately measure wavefronts. This advanced optical testing method overcomes common nonlinear and environmental challenges in interferometry.

Keywords:

Lateral shearing of crystals Multi-directional shearing interferometry Synchronous polarization phase-shifting

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Area of Science:

Optical Engineering
Metrology
Wavefront Sensing

Background:

Synchronous phase-shifting interferometry often suffers from nonlinearities and environmental disturbances.
Acquiring multi-directional shear wavefront information is crucial for accurate optical component testing.

Purpose of the Study:

To introduce a multi-directional shearing synchronous polarization phase-shifting interferometer.
To mitigate nonlinear issues and environmental influences in interferometry.
To enable multi-directional shear wavefront acquisition for improved wavefront reconstruction.

Main Methods:

Utilized a birefringent crystal displacer for multi-directional shearing.
Employed polarization phase-shifting for synchronous phase acquisition.
Developed coefficient fitting using multi-directional differential wavefront data for reconstruction.
Investigated crystal birefringence, phase grating diffraction, and polarization phase-shifting array characteristics.

Main Results:

Successfully mitigated nonlinear issues and environmental influences.
Enabled acquisition of shear wavefront information from multiple directions.
Demonstrated accurate wavefront reconstruction through coefficient fitting.
Experimental testing on a spherical optical component validated system accuracy.

Conclusions:

The developed interferometer offers a robust solution for precise wavefront measurement.
The multi-directional shearing and polarization phase-shifting approach enhances reliability and accuracy.
Results show strong agreement with established methods like ZYGO testing.