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Estimating delay dispersion in Coherence Imaging Spectroscopy (CIS) is crucial for fusion plasma diagnostics. New extrapolation and interpolation methods were validated, showing best accuracy (<2%) with simpler CIS setups.

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Area of Science:

  • Physics
  • Plasma Physics
  • Optical Diagnostics

Background:

  • Coherence Imaging Spectroscopy (CIS) is a camera-based polarization interferometry technique.
  • CIS provides high-resolution 2D spectroscopic measurements, commonly used in fusion plasma diagnostics.
  • Accurate characterization of delay dispersion is essential for deriving physics-relevant quantities from CIS data.

Purpose of the Study:

  • To validate delay dispersion estimation methods for Coherence Imaging Spectroscopy (CIS).
  • To assess methods for wavelength ranges inaccessible to conventional calibration sources.
  • To evaluate the impact of system hardware on estimation precision.

Main Methods:

  • Validation of extrapolation and interpolation methods for delay dispersion estimation.
  • Utilized simulation of system response and power-law fits of measurements.
  • Employed two tunable lasers (450-750 nm) and tested three different CIS systems.

Main Results:

  • The simplest CIS setup achieved the lowest deviation (<2%) between estimated and measured delay dispersion.
  • More complex CIS systems showed deviations up to 20%, with spatial structures impacting accuracy.
  • Crystal alignment and lens quality significantly influence estimation precision.

Conclusions:

  • Extrapolation and interpolation methods can effectively estimate CIS delay dispersion, especially for challenging wavelength ranges.
  • Simpler CIS system designs are less prone to hardware imperfections, leading to more precise delay dispersion estimations.
  • The study highlights the importance of hardware quality and alignment in accurate CIS diagnostic data interpretation.