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Scanning monochromatic spatial low-coherence interferometer.

Xiaoke Wan1, Jian Ge

  • 1Department of Astronomy, University of Florida, Gainesville, Florida 32611, USA. xwan@astro.ufl.edu

Optics Letters
|October 4, 2011
PubMed
Summary
This summary is machine-generated.

Scanning spatial low-coherence interferometry (S-LCI) offers angle resolving and depth discrimination. This technique simultaneously measures refractive index and thickness of materials in a single step.

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Area of Science:

  • Optics
  • Interferometry
  • Materials Science

Background:

  • Conventional temporal low-coherence interferometry (T-LCI) is limited in depth discrimination.
  • Spatial low-coherence interferometry (S-LCI) offers enhanced capabilities.
  • S-LCI utilizes an off-axis converging laser beam for probing.

Purpose of the Study:

  • To demonstrate the capabilities of scanning spatial low-coherence interferometry (S-LCI).
  • To measure angle-dependent phase shifts and material properties.
  • To achieve simultaneous refractive index and thickness determination.

Main Methods:

  • Employing a scanning spatial low-coherence interferometer (S-LCI).
  • Utilizing an off-axis converging single wavelength laser beam.
  • Processing signals and data similar to temporal low-coherence interferometry (T-LCI).
  • Accurately scaling incident angles in the Fourier domain.

Main Results:

  • Demonstrated angle resolving and depth discrimination capabilities of S-LCI.
  • Successfully measured angle-dependent phase shifts from multiple reflections.
  • Obtained simultaneous refractive index and geometric thickness of a glass plate.

Conclusions:

  • S-LCI provides significant advantages over T-LCI.
  • The developed S-LCI method enables efficient, one-step material characterization.
  • S-LCI is a powerful tool for precise optical metrology.