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Experimental and Data Analysis Workflow for Soft Matter Nanoindentation
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Sinusoidal nonlinearity in wavelength-sweeping interferometry.

Luc Perret1, Pierre Pfeiffer

  • 1Laboratoire des Systèmes Photoniques, Université Louis Pasteur-Ecole Nationale Supérieure de Physique de Strasbourg, Boulevard Brant, BP10413, 67412 Illkirch, France. luc.perret@ensps.u-strasbg.fr

Applied Optics
|November 21, 2007
PubMed
Summary
This summary is machine-generated.

Nonlinearities in wavelength sweeping speed do not hinder absolute distance interferometry resolution. Sinusoidal nonlinearities are robust, offering good measurement uncertainty via Fourier transforms, with optimal frequency and amplitude values identified.

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Area of Science:

  • Optics and Photonics
  • Metrology
  • Laser Interferometry

Background:

  • Absolute distance interferometry (ADI) is crucial for high-precision measurements.
  • Wavelength sweeping is a common technique in ADI, but nonlinearities can affect signal quality.
  • External cavity laser sources are employed for wavelength-tunable light generation.

Purpose of the Study:

  • To investigate the impact of nonlinearities in wavelength sweeping speed on interferometric signals in ADI.
  • To determine the robustness of ADI techniques in the presence of such nonlinearities.
  • To analyze the influence of sinusoidal nonlinearities and identify optimal parameters.

Main Methods:

  • Experimental setup utilizing an external cavity laser source for wavelength sweeping.
  • Acquisition of interferometric signals in reference and target arms.
  • Modeling nonlinearities as a sum of sinusoids.
  • Implementation of a simulation to analyze parameter influence.
  • Application of Fourier transform techniques for signal processing.

Main Results:

  • Experimental results show good resolution despite wavelength sweep nonlinearities.
  • Sinusoidal nonlinearities were found to be robust, yielding good measurement uncertainty.
  • Simulation analysis indicated that specific frequency and amplitude values for sinusoidal nonlinearities are optimal.

Conclusions:

  • Nonlinearities in wavelength sweeping speed do not fundamentally limit the resolution of absolute distance interferometry.
  • Sinusoidal nonlinearities can be effectively managed using Fourier transform methods.
  • Optimal frequency and amplitude parameters exist for sinusoidal nonlinearities, enhancing measurement accuracy.