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Related Experiment Videos

Improved method for calibrating a Stokes polarimeter.

Bruno Boulbry1, Jessica C Ramella-Roman, Thomas A Germer

  • 1Optical Technology Division, National Institute of Standards and Technology, Gaithersburg, MD 20886, USA.

Applied Optics
|December 12, 2007
PubMed
Summary
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A new calibration method for polarization state analyzers uses reference states and matrix pseudoinversion. This technique improves accuracy by employing singular value decomposition for optical instrument calibration.

Area of Science:

  • Optical Engineering
  • Metrology
  • Polarimetry

Background:

  • Accurate calibration of polarization state analyzers is crucial for reliable optical measurements.
  • Existing methods may rely on specific optical assumptions or lack robustness for field instruments.

Purpose of the Study:

  • To present a novel, assumption-free method for calibrating polarization state analyzers.
  • To enhance the calibration process using singular value decomposition for improved accuracy and traceability.

Main Methods:

  • Utilizes a set of well-characterized reference polarization states.
  • Constructs a data matrix and employs matrix pseudoinversion via singular value decomposition (SVD).
  • Retains the four largest singular values to handle typically singular matrices.

Related Experiment Videos

Main Results:

  • Successfully demonstrated the calibration technique on an imaging polarimeter.
  • Validated the method with liquid crystal variable retarders and LED illumination at multiple wavelengths (472 nm, 525 nm, 630 nm).
  • Generated reference states using an unpolarized source, polarizer, and Fresnel rhomb.

Conclusions:

  • The developed method offers a robust approach for calibrating polarization state analyzers without prior optical assumptions.
  • It is particularly valuable for calibrating field-grade instruments and maintaining traceability chains.