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Related Experiment Videos

Laser wipers

Karpetis1, White, Sreenivasan

  • 1Mason Laboratory, Yale University, New Haven, Connecticut 06520, USA.

Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics
|November 23, 2000
PubMed
Summary

Lasers can now clean inaccessible optical windows, like those on liquid helium cryostats. Radiation forces from lasers effectively remove particle deposits, surpassing other forces.

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Area of Science:

  • Physics
  • Optical Engineering
  • Materials Science

Background:

  • Optical windows in cryostats are prone to particle contamination.
  • Cleaning these windows is challenging due to inaccessibility.
  • Contamination can impair optical performance and experimental accuracy.

Purpose of the Study:

  • To introduce a novel laser-based method for cleaning particle deposits.
  • To demonstrate the application in liquid helium cryostats.
  • To provide a theoretical explanation for the cleaning mechanism.

Main Methods:

  • Application of focused laser beams to optical windows.
  • Observation and analysis of particle removal.
  • Theoretical modeling of forces acting on particles.

Main Results:

  • Successful removal of particle deposits from optical windows using lasers.
  • Observation attributed to significant radiation forces exerted by the laser.
  • Estimated laser radiation forces exceed other forces (e.g., van der Waals, electrostatic).

Conclusions:

  • Lasers offer a viable, non-contact solution for cleaning contaminated optical windows.
  • Radiation force is the dominant mechanism for particle detachment.
  • This technique has significant implications for maintaining optical clarity in sensitive cryogenic environments.

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