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Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
08:39

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Published on: January 28, 2019

Diffraction-based determination of the phase modulation for general spatial light modulators.

David Engström1, Gabriel Milewski, Jörgen Bengtsson

  • 1Photonics Laboratory, Department of Microtechnology and Nanoscience, Chalmers University of Technology, Göteborg, Sweden. david.engstrom@mc2.chalmers.se

Applied Optics
|September 20, 2006
PubMed
Summary

This study introduces a simple diffraction-based method for measuring the phase modulation of spatial light modulators (SLMs). The technique offers accurate, in situ measurements even with low coherence light sources and significant vibrations.

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Area of Science:

  • Optics and Photonics
  • Optical Metrology
  • Materials Science

Background:

  • Spatial light modulators (SLMs) are crucial optical components for wavefront manipulation.
  • Accurate characterization of SLM phase response is essential for advanced optical systems.
  • Conventional interferometer-based methods can be complex and sensitive to environmental factors.

Purpose of the Study:

  • To present a novel diffraction-based characterization method for SLM phase response.
  • To demonstrate the method's advantages over traditional interferometer techniques.
  • To validate the method's accuracy and applicability under various conditions.

Main Methods:

  • A simple diffraction setup is employed for in situ phase response measurements.
  • The method utilizes a low temporal coherence light source, such as an LED.
  • It accommodates substantial mechanical vibration, simplifying experimental requirements.

Main Results:

  • The diffraction method accurately determines phase modulation values across the full 2π rad range.
  • Phase determination is successful even for SLMs with nulls in their amplitude transmission.
  • Experimental comparisons validate the accuracy against interferometer measurements.

Conclusions:

  • The proposed diffraction-based method provides a robust and simple alternative for SLM characterization.
  • Its tolerance to vibration and low coherence light sources broadens practical applications.
  • This technique enables accurate phase modulation measurements for diverse SLM types.