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Three-dimensional phase imaging with a scanning optical-fiber interferometer.

J N Walford1, K A Nugent, A Roberts

  • 1School of Physics, University of Melbourne, Parkville 3052, Australia.

Applied Optics
|March 6, 2008
PubMed
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A new scanning optical-fiber interferometer quantifies wave field phase in 3D. This robust method is insensitive to intensity variations, ideal for confined optical beams and near-field measurements.

Area of Science:

  • Optics and Photonics
  • Wave Physics
  • Interferometry

Background:

  • Measuring the phase of propagating wave fields is crucial in optics.
  • Existing methods can be sensitive to intensity fluctuations, limiting their application.
  • Characterizing near-field optical beams requires precise phase information.

Purpose of the Study:

  • To develop a quantitative method for 3D wave field phase measurement.
  • To create a technique insensitive to intensity variations in optical beams.
  • To apply and validate the method for near-field optical fiber measurements.

Main Methods:

  • Utilized a scanning optical-fiber interferometer.
  • Employed phase modulation in the reference arm.
  • Used a single detector without lock-in electronics.

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Main Results:

  • Successfully measured the 3D phase of a propagating wave field.
  • Demonstrated insensitivity to large intensity variations.
  • Obtained results in good agreement with theoretical predictions for a cleaved optical fiber's near field.

Conclusions:

  • The developed scanning optical-fiber interferometer offers a robust quantitative method for phase measurement.
  • The technique is highly suitable for analyzing spatially confined optical beams.
  • Validated the method's accuracy through near-field optical fiber characterization.