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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

Spatial amplitude and phase modulation using commercial twisted nematic LCDs.

E G van Putten¹, I M Vellekoop, A P Mosk

¹Complex Photonic Systerms, Faculty of Sciences and Technology and MESA+ Institute for Nanotechnology, University of Twente, AE Enschede, The Netherlands. E.G.vanPutten@utwente.nl

|April 22, 2008

Summary

We developed a new method for precise laser beam control using a liquid crystal display (LCD) and spatial filtering. This technique allows independent modulation of light

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Area of Science:

Optics and Photonics
Laser Technology
Materials Science

Background:

Precise control over laser beam properties is crucial for various scientific and technological applications.
Existing methods for spatial phase and amplitude modulation often have limitations in flexibility or require specialized equipment.

Purpose of the Study:

To present a novel method for achieving full spatial phase and amplitude control of a laser beam.
To demonstrate the independent modulation capability using a cost-effective setup.

Main Methods:

Utilized a twisted nematic liquid crystal display (LCD) for light modulation.
Implemented spatial filtering to combine four neighboring pixels into a single superpixel.
Achieved independent modulation of phase and amplitude at each superpixel.

Main Results:

Successfully demonstrated independent spatial phase and amplitude modulation of a laser beam.
The technique proved effective even with imperfect spatial light modulators.
The method does not impose special requirements on the spatial light modulator.

Conclusions:

The proposed method offers a versatile and robust approach for laser beam shaping.
This technique enables precise control over optical fields, enhancing applications in laser science and engineering.
The use of readily available components like LCDs makes this method accessible.