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Convergent Polishing: A Simple, Rapid, Full Aperture Polishing Process of High Quality Optical Flats & Spheres
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Optimization and application of influence function in abrasive jet polishing.

Zhaoze Li1, Shengyi Li, Yifan Dai

  • 1National University of Defense Technology, DeYa, Changsha, Hunan Province 410073 China. lzzsp@yahoo.cn

Applied Optics
|May 22, 2010
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Summary

This study optimizes abrasive jet polishing (AJP) by refining its influence function for precision optics. The improved method significantly reduces surface irregularities in BK7 optical glass, achieving a smoother finish.

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Area of Science:

  • Materials Science
  • Optical Engineering
  • Fluid Dynamics

Background:

  • Abrasive Jet Polishing (AJP) is a key technology for optical surface finishing.
  • Traditional AJP influence functions are non-Gaussian and unsuitable for precise optical figuring.
  • Understanding material removal mechanisms is crucial for optimizing AJP.

Purpose of the Study:

  • To analyze the material removal mechanism of AJP based on fluid impact dynamics.
  • To optimize the AJP influence function for a Gaussian shape suitable for corrective figuring.
  • To validate the optimized AJP system for precision polishing of optical components.

Main Methods:

  • Computational fluid dynamics (CFD) simulations and experimental analysis were used to study AJP.
  • Influence functions were obtained at various impingement angles.
  • An oblique nozzle rotation technique was employed to achieve an optimized Gaussian influence function.
  • A computed numerically controlled experimental system was developed for AJP.

Main Results:

  • The study found that initial AJP influence functions are non-Gaussian and irregular.
  • Optimizing the nozzle angle resulted in a stable, Gaussian-shaped influence function with +/-5% fluctuation.
  • Polishing a 20mm BK7 optical glass reduced peak-to-valley (PV) from 1.43λ to 0.294λ and root-mean-square (RMS) from 0.195λ to 0.029λ.
  • Achieved surface roughness was within 2nm.

Conclusions:

  • The optimized Gaussian influence function is effective for precision optics figuring and polishing.
  • The developed AJP system demonstrates high precision and repeatability.
  • This research advances AJP technology for demanding optical applications.