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Laser phase noise reduction for industrial interferometric applications.

Marc Dubois1, Kent C Burr, Thomas E Drake

  • 1General Electric Global Research, Schenectady, New York 12301-0008, USA. dubois@crd.ge.com

Applied Optics
|August 10, 2004
PubMed
Summary

Laser ultrasound inspection for advanced jet fighters uses laser interferometry. New techniques using photorefractive crystals and Sagnac cavities reduce laser phase noise, improving signal quality in composite manufacturing.

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Area of Science:

  • Materials Science
  • Optics and Photonics
  • Non-Destructive Testing

Background:

  • Laser ultrasound is crucial for inspecting composite materials in advanced jet fighter manufacturing.
  • Laser interferometry detects ultrasonic displacements, but signal-to-noise ratio is limited by laser phase noise in practical applications.

Purpose of the Study:

  • To present novel techniques for mitigating laser phase noise in laser ultrasound inspection.
  • To enhance the signal-to-noise ratio for more reliable composite material analysis.

Main Methods:

  • Replacing the standard dual-cavity Fabry-Perot interferometer with a photorefractive crystal-based interferometer.
  • Implementing a high-finesse Sagnac cavity to filter phase noise from the detection laser.

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Main Results:

  • Both presented techniques effectively reduce the impact of laser phase noise.
  • Experimental validation confirms significant improvements in signal quality.

Conclusions:

  • The developed techniques overcome practical limitations of laser phase noise in laser ultrasound.
  • These advancements enable more robust and accurate ultrasonic inspection of composites for aerospace applications.