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Updated: Sep 20, 2025

Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating

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Published on: October 11, 2016

Double-frequency grating shearing interferometer with built-in phase-shifting function for robust multi-level phase

Yeh-Wei Yu¹, Tsung-Yi Hou¹, Tsung-Hsun Yang¹

¹Department of Optics and Photonics, National Central University, Chung-Li, 32001, Taiwan.

Scientific Reports

|June 8, 2022

Summary

This summary is machine-generated.

This study introduces a novel interferometer and signal processing method for retrieving multilevel phase signals. The new system enhances data processing for optical data storage and free-space communication.

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Area of Science:

Optics and Photonics
Signal Processing
Optical Metrology

Background:

Phase retrieval is crucial for optical testing and data processing.
Existing methods can be sensitive to environmental disturbances and introduce errors.
Multilevel phase signals require advanced retrieval techniques.

Purpose of the Study:

To propose and demonstrate a novel interferometer for retrieving two-dimensional (2D) signals with multilevel phases.
To develop a signal processing technique that eliminates phase errors and enhances robustness.
To improve data processing capabilities for high-speed optical applications.

Main Methods:

Utilizing a shearing interferometer with a double-frequency grating.
Integrating phase-shifting interferometry as a function of grating displacement.
Implementing a common path algorithm for enhanced stability.
Developing a pre-integral signal process for 2D data handling.

Main Results:

Successful retrieval of multilevel phase signals.
Effective elimination of slow-varying phase errors.
Demonstrated robustness in dynamic optical testing scenarios.
Validation of the pre-integral process through simulation and experiment.

Conclusions:

The proposed interferometer and pre-integral signal process offer significant advantages for multilevel phase retrieval.
The system is robust and suitable for dynamic optical testing and data processing.
This advancement holds potential for higher data rates in optical data storage and free-space communication.