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Related Experiment Video

Updated: Feb 25, 2026

Compact Lens-less Digital Holographic Microscope for MEMS Inspection and Characterization

Compact Lens-less Digital Holographic Microscope for MEMS Inspection and Characterization

Published on: July 5, 2016

Vortex-free phase profiles for uniform patterning with computer-generated holography.

Marc Guillon, Benoît C Forget, Amanda J Foust

|August 9, 2017

Summary

This summary is machine-generated.

This study introduces a new method to eliminate phase vortices in computer-generated holography, improving light pattern uniformity. The technique uses spatial filtering and phase-based complex amplitude control for smoother, more efficient light patterns.

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Last Updated: Feb 25, 2026

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

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

Published on: January 28, 2019

Area of Science:

Optics and Photonics
Holography
Wavefront Modulation

Background:

Computer-generated holography (CGH) uses phase-only modulation for efficient light pattern generation.
Iterative Fourier Transform Algorithms (IFTA) approximate perfect patterning but can introduce phase vortices, reducing uniformity.
Phase vortices cause destructive interference, complicating light pattern control.

Purpose of the Study:

To develop a novel approach for eliminating phase vortices in CGH.
To achieve smooth, uniform light patterns with high diffraction efficiency.
To demonstrate a practical experimental scheme for complex amplitude modulation using phase-only Spatial Light Modulators (SLMs).

Main Methods:

Theoretical, numerical, and experimental demonstration of the novel approach.
Spatially filtering the phase input to the IFTA.
Combining spatial filtering with phase-based complex amplitude control at the SLM plane.
Experimental implementation using a phase-only SLM for complex amplitude modulation.

Main Results:

Successful elimination of phase vortices, leading to smoother light patterns.
Generation of continuous and centered fields of excitation.
Characterization of trade-offs between pattern uniformity, diffraction efficiency, and axial confinement.

Conclusions:

The proposed method effectively eliminates phase vortices in CGH.
This technique enables the generation of high-quality, uniform light patterns with controlled complex amplitude.
The experimental scheme provides a versatile tool for advanced holographic applications.