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The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry

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Compact single-shot radial shearing interferometer with random phase shift.

Naiting Gu, Benxi Yao, Linhai Huang

|September 16, 2017

Summary

This summary is machine-generated.

We developed a compact phase-shifting radial shearing interferometer using a pixelated micro-retarder array (MRA). This novel design simplifies fabrication and enables wavefront extraction with random phase shifts, offering vibration immunity and broad spectral range.

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Area of Science:

Optics and Photonics
Interferometry
Wavefront Sensing

Background:

Phase-shifting interferometry is crucial for precise wavefront measurement.
Traditional shearing interferometers often face challenges in compactness and fabrication complexity.
Micro-optics offer potential for miniaturized and advanced optical systems.

Purpose of the Study:

To propose a novel compact phase-shifting radial shearing interferometer.
To introduce a pixelated micro-retarder array (MRA) for simplified phase shifting.
To demonstrate a method for wavefront extraction with random phase shifts.

Main Methods:

Design and fabrication of a micro-retarder array (MRA) using a birefringence plate with varying thicknesses.
Utilizing different orientations of the MRA's fast axis to introduce pixelated phase delays.
Developing an algorithm for wavefront extraction accommodating random phase shifts.

Main Results:

Successful introduction of pixelated phase delay using the MRA.
Validation of the wavefront extraction method through numerical analysis.
Demonstration of the interferometer's feasibility and accuracy.

Conclusions:

The proposed compact phase-shifting radial shearing interferometer with an MRA is feasible and accurate.
The method simplifies MRA fabrication and wavefront extraction.
The interferometer offers vibration immunity, simultaneous phase stepping, and a broad spectral range for applications like dynamic process detection.