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

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Mapping phases of singular scalar light fields.

Vladimir G Denisenko¹, Alexander Minovich, Anton S Desyatnikov

¹Nonlinear Physics Center, Australian National University, Canberra, ACT 0200, Australia.

|December 25, 2007

Summary

Researchers developed a simple polarimetric method for accurate light field phase measurements. This technique reconstructs signal phase from polarization maps, enabling detailed analysis of optical vortices.

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Area of Science:

Optics and Photonics
Quantum Optics

Background:

Accurate measurement of light field phase distributions is crucial for various optical applications.
Existing methods for phase measurement can be complex or limited in scope.

Purpose of the Study:

To implement and demonstrate a simple, accurate experimental method for measuring scalar light field phase distributions.
To validate the method's capability in resolving complex optical phenomena like vortex structures.

Main Methods:

The study employs a polarimetric technique utilizing coaxial superposition of orthogonally polarized reference and signal beams.
Polarization maps of the resulting vector field are recorded to reconstruct the phase information of the signal beam.

Main Results:

The method successfully achieved accurate measurements of phase distributions in scalar light fields.
Topologically neutral pairs of vortices in a speckle field were resolved with high precision.
The positions of vortices within a Laguerre-Gaussian beam (topological charge three) were accurately recovered.

Conclusions:

The developed polarimetric method offers a straightforward and effective approach for precise phase measurements of light fields.
This technique is versatile and capable of analyzing intricate phase structures, including multiple optical vortices.