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

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All-digital wavefront sensing for structured light beams.

Angela Dudley, Giovanni Milione, Robert R Alfano

|June 13, 2014

Summary

This summary is machine-generated.

We developed a new digital method to measure light beam wavefronts using polarization and holograms. This technique accurately captures wavefronts of various light fields without moving parts, even over long distances.

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Area of Science:

Optics and Photonics
Digital Holography
Polarization Optics

Background:

Wavefront measurement is crucial for understanding and manipulating light.
Traditional methods often require mechanical components or are limited in scope.
Structured light fields possess complex wavefronts that are challenging to characterize.

Purpose of the Study:

To introduce a novel, all-digital technique for wavefront extraction of structured light beams.
To demonstrate real-time phase measurement between orthogonal polarization states.
To enable wavefront measurement of propagating light fields over extended distances without moving parts.

Main Methods:

Utilizing non-homogeneous polarization optics.
Employing dynamic, digital holograms written to a spatial light modulator (SLM).
Measuring the real-time phase relationship between orthogonal polarization states.

Main Results:

Successfully extracted wavefront information from structured light beams.
Demonstrated the technique's applicability to propagating optical vortices, Bessel, Airy, and speckle fields.
Achieved excellent agreement between extracted and programmed wavefronts.

Conclusions:

The presented all-digital technique offers a versatile and robust method for wavefront measurement.
This approach eliminates the need for mechanical components, simplifying complex optical measurements.
The technique provides accurate wavefront characterization for diverse structured light fields.