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Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator

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Phase-shifting lateral shearing interferometry using wedge-plate and interferometric grating.

Reena Disawal, Jitendra Dhanotia, Shashi Prakash

|November 18, 2014

Summary

This summary is machine-generated.

A novel phase-shifting technique for wedge-plate lateral shearing interferometers (LSI) was developed. This method uses moiré patterns and grating translation for precise phase measurement, successfully tested for optical beam collimation.

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Area of Science:

Optics and Photonics
Interferometry
Optical Metrology

Background:

Wedge-plate lateral shearing interferometers (LSI) are valuable tools in optical testing.
Introducing controlled phase shifts is crucial for quantitative phase measurement in interferometry.
Existing methods for phase shifting in LSI can be complex or lack robustness.

Purpose of the Study:

To propose a simple and robust method for incorporating phase-shifting into a wedge-plate lateral shearing interferometer.
To enable direct and accurate phase measurement using the enhanced LSI.
To demonstrate the practical application of the developed phase-shifting LSI.

Main Methods:

Superposing the output of a wedge-plate LSI onto a sinusoidal grating to create a moiré pattern.
Utilizing in-plane translation of the grating, perpendicular to its lines, to introduce known phase shifts.
Implementing a four-step phase-shifting algorithm for direct phase measurement.

Main Results:

Successful implementation of a phase-shifting capability in a wedge-plate LSI.
Generation of moiré patterns for phase analysis.
Demonstrated accuracy and precision in phase measurement.
Successful application in testing the collimation position of optical beams.

Conclusions:

The proposed phase-shifting technique is a simple and robust addition to wedge-plate LSI.
The method allows for accurate quantitative phase measurements.
The developed phase-shifting wedge-plate LSI is effective for practical optical alignment tasks, such as setting beam collimation.