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Simultaneous wavenumber measurement and coherence detection using temporal phase unwrapping.

A Davila1, J M Huntley, C Pallikarakis

  • 1Loughborough University, Wolfson School of Mechanical and Manufacturing Engineering, Loughborough, Leicestershire, UK. adavila@cio.mx

Applied Optics
|February 15, 2012
PubMed
Summary

Accurately measure laser wavenumber changes using a novel multi-wedge interferometry method. This technique offers high resolution and immunity to jumps, enabling dynamic monitoring and automatic coherence loss detection.

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Area of Science:

  • Optical Physics
  • Metrology

Background:

  • Accurate measurement of time-varying laser wavenumber is crucial for wavelength scanning interferometry and swept-source optical coherence tomography.
  • Existing methods may struggle with large wavenumber jumps and require complex setups.

Purpose of the Study:

  • To present a new method for precise, real-time laser wavenumber shift measurement.
  • To achieve high wavenumber resolution and immunity to ambiguities from large wavenumber jumps.

Main Methods:

  • Utilizing interferograms from multiple optical wedges to capture all necessary data in a single image.
  • Employing a two-dimensional Fourier transform for phase detection, followed by temporal phase unwrapping and dispersion correction.
  • Implementing a robust method for determining wedge thicknesses using low-cost components.

Main Results:

  • Demonstrated simultaneous high wavenumber resolution and immunity to wavenumber jump ambiguities.
  • Enabled dynamic wavenumber monitoring with automatic detection of laser coherence loss.
  • Achieved a root mean square (rms) difference of ~4 m⁻¹ in wavenumber shift compared to a commercial wavemeter, equivalent to ~0.4 pm wavelength error.

Conclusions:

  • The described multi-wedge interferometry method provides an accurate and robust solution for dynamic laser wavenumber monitoring.
  • This technique is suitable for applications like swept-source optical coherence tomography and wavelength scanning interferometry.
  • The use of low-cost optical components and a simple analysis algorithm makes the method accessible.