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Related Experiment Video

Updated: Apr 28, 2026

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

White light wavefront control with a spatial light modulator.

Dirk-Mathys Spangenberg, Angela Dudley, Pieter H Neethling

|June 13, 2014

Summary

This summary is machine-generated.

Spatial light modulators can now shape broadband light sources, overcoming previous wavelength-dependent limitations. This breakthrough enables new possibilities for white-light beam shaping and optical manipulation.

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Area of Science:

Optics and Photonics
Laser Physics
Wavefront Engineering

Background:

Spatial light modulators (SLMs) are essential for controlling light wavefronts and shaping laser beams.
Traditional SLM applications are limited to monochromatic light due to wavelength-dependent calibration and phase manipulation.
This wavelength dependence restricts the use of SLMs with broadband or white-light sources.

Purpose of the Study:

To demonstrate that spatial light modulators can shape broadband light sources without inherent wavelength dependence.
To present a method for achieving wavelength-independent phase manipulation with SLMs for broadband sources.
To experimentally validate the mathematical principle using a supercontinuum source.

Main Methods:

Mathematical formulation of a novel principle for wavelength-independent phase control using SLMs.
Experimental setup utilizing a supercontinuum laser source.
Application of the SLM to shape the output beam's phase characteristics.

Main Results:

Successful demonstration of shaping broadband sources using SLMs without wavelength dependence.
Experimental generation of rotating white-light Bessel beams.
Confirmation that the shaped beams carry orbital angular momentum.

Conclusions:

Spatial light modulators can be effectively utilized for wavefront control of broadband sources.
The developed method overcomes the traditional wavelength dependency limitations of SLMs.
This opens new avenues for applications in optical manipulation and beam shaping with white light.