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

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Polarization phase stepping with a savart element.

A L Weijers, H van Brug, H J Frankena

|February 21, 2008

Summary

This study presents a real-time shearing interferometer using Savart elements for polarization phase-stepping. It details imaging properties and ray propagation effects for enhanced optical measurements.

Area of Science:

Optics and Photonics
Optical Instrumentation
Interferometry

Background:

Shearing interferometry is a powerful technique for optical testing.
Real-time interferometry is crucial for dynamic optical system analysis.
Polarization-based phase-stepping offers high-resolution phase measurement.

Purpose of the Study:

To present the imaging properties of a novel real-time shearing interferometer.
To demonstrate the use of Savart elements in a polarization phase-stepping scheme.
To analyze ray propagation and image formation through birefringent elements.

Main Methods:

Development of a real-time, two-camera, four-bucket shearing interferometer.
Utilizing Savart elements as both beam displacers and polarization analyzers.

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

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Implementing a simple calculation scheme for ray propagation in uniaxial birefringent materials.

Main Results:

Successful demonstration of a real-time shearing interferometer with polarization phase-stepping.
Characterization of imaging properties and performance of Savart elements.
Analysis of the impact of 6-cm-long Savart elements on image formation.

Conclusions:

The presented real-time shearing interferometer effectively utilizes Savart elements for polarization phase-stepping.
The study provides insights into ray propagation and image formation in birefringent optical systems.
This technique offers potential for advanced optical testing and metrology.