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Confocal laser induced fluorescence with comparable spatial localization to the conventional method.

Derek S Thompson1, Miguel F Henriquez1, Earl E Scime1

  • 1Department of Physics and Astronomy, West Virginia University, Morgantown, West Virginia 26506, USA.

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|November 3, 2017
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Summary
This summary is machine-generated.

A novel confocal fluorescence telescope improves laser-induced fluorescence (LIF) measurements in argon plasma. This technique achieves high spatial localization with a single viewport, overcoming limitations of conventional methods.

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Area of Science:

  • Plasma Physics
  • Atomic and Molecular Physics
  • Optical Diagnostics

Background:

  • Laser-induced fluorescence (LIF) is a crucial diagnostic for plasma velocity measurements.
  • Conventional LIF requires multiple optical access ports, limiting its application.
  • Existing methods struggle with spatial localization, impacting measurement accuracy.

Purpose of the Study:

  • To introduce a new confocal fluorescence telescope design for enhanced spatial localization in LIF.
  • To demonstrate the feasibility of single-viewport LIF measurements in argon plasma.
  • To overcome the limitations of conventional LIF techniques in confined or limited-access environments.

Main Methods:

  • Development of a patent-pending confocal fluorescence telescope with large objective lenses and a central obscuration.
  • Utilizing a spatial filter for high spatial localization along the laser injection direction.
  • Modeling injection and collection optics to theoretically estimate spatial localization (FWHM).

Main Results:

  • Achieved approximately 1.4 mm spatial localization at a 148.7 mm focal length.
  • Demonstrated an order of magnitude improvement over previously published designs.
  • Approached the localization of conventional methods without requiring perpendicular optical paths.

Conclusions:

  • The confocal fluorescence telescope significantly enhances spatial resolution in LIF measurements.
  • This single-viewport technique expands the applicability of LIF to challenging experimental setups.
  • The improved localization and reduced access requirements offer a more versatile plasma diagnostic tool.