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Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
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Sagnac-interferometer-based characterization of spatial light modulators.

Jian Wei Tay1, Michael A Taylor, Warwick P Bowen

  • 1Jack Dodd Centre for Quantum Science, Physics Department, Otago University, P.O. Box 56, Dunedin, New Zealand.

Applied Optics
|April 22, 2009
PubMed
Summary
This summary is machine-generated.

A novel Sagnac interferometer method accurately measures spatial light modulator (SLM) phase response. This technique simplifies phase characterization and enables linearization for improved SLM performance.

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Area of Science:

  • Optics and Photonics
  • Interferometry
  • Optical Metrology

Background:

  • Spatial light modulators (SLMs) are crucial optical components.
  • Accurate characterization of SLM phase response is essential for advanced optical systems.
  • Existing phase measurement techniques can be complex or lack stability.

Purpose of the Study:

  • To propose and demonstrate a simple and accurate method for characterizing SLM phase response.
  • To leverage the inherent stability of Sagnac interferometers for phase measurement.
  • To improve upon conventional diffraction-based and interferometric techniques.

Main Methods:

  • Utilizing a Sagnac interferometer setup.
  • Characterizing the phase response of a commercial liquid crystal on silicon (LCoS) SLM.
  • Employing a programmable lookup table for phase linearization.

Main Results:

  • Demonstrated a simple and accurate phase measurement technique.
  • Successfully characterized the phase response of an LCoS SLM.
  • Linearized the SLM phase response using a lookup table.
  • Measured the transverse phase profile across the SLM surface.

Conclusions:

  • The Sagnac interferometer method offers a significant improvement for SLM phase characterization.
  • The proposed technique provides a stable and precise approach to phase measurement.
  • Linearization via a lookup table enhances SLM operational accuracy.