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Quadriwave lateral shearing interferometer based on a randomly encoded hybrid grating.

Tong Ling, Dong Liu, Xiumei Yue

|September 23, 2015

Summary

This summary is machine-generated.

A new compact quadriwave lateral shearing interferometer (QWLSI) uses a novel randomly encoded hybrid grating (REHG) for high-precision wavefront measurement. This innovative design offers strong adaptability and repeatability without needing an order selection mask.

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Area of Science:

Optics and Photonics
Interferometry
Diffraction Gratings

Background:

Wavefront measurement is crucial in optical testing.
Existing interferometers can be complex and lack adaptability.
There is a need for compact, high-precision interferometric systems.

Purpose of the Study:

To propose a compact quadriwave lateral shearing interferometer (QWLSI).
To enhance adaptability and precision in wavefront sensing.
To introduce a novel randomly encoded hybrid grating (REHG) for interferometry.

Main Methods:

Utilizing inverse Fourier transform on ±1 Fraunhofer diffraction orders.
Generating ideal quadriwave grating amplitude and phase distributions.
Employing a phase chessboard and random encoding for amplitude quantization.

Main Results:

The randomly encoded hybrid grating lateral shearing interferometer (REHG-LSI) was designed and simulated.
Experimental validation confirmed the system's performance.
The REHG-LSI demonstrated strong adaptability and high precision.

Conclusions:

The proposed REHG-LSI offers a compact and precise solution for wavefront measurement.
The novel grating design eliminates the need for an order selection mask.
The system shows excellent repeatability and adaptability for various applications.