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A method for evaluating subsurface damage in optical glass.

Yaguo Li1, Hao Huang, Ruiqing Xie

  • 1Fine Optical Engineering Research Center, Chengdu 610041, China. yargolee@163.com

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Summary

A new method accurately measures subsurface damage (SSD) depth and morphology in fused silica simultaneously. This technique is effective for inspecting optical components, offering a practical alternative to traditional methods.

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Area of Science:

  • Materials Science
  • Optical Engineering
  • Metrology

Background:

  • Subsurface damage (SSD) in optical components can degrade performance.
  • Accurate characterization of SSD depth and morphology is crucial for quality control.
  • Traditional methods for SSD evaluation can be time-consuming or limited in scope.

Purpose of the Study:

  • To present an alternative, simultaneous method for evaluating subsurface damage (SSD) in ground fused silica.
  • To leverage the relationship between numerical aperture (NA), magnification, and depth of field in optical microscopy.
  • To provide a practicable and effective inspection technique for optical components.

Main Methods:

  • Utilizing optical microscopy with a reduced depth of field by increasing numerical aperture (NA) and magnification.
  • Developing a method to simultaneously acquire information on both the depth and morphology of subsurface damage.
  • Experimenting on fused silica samples ground with bound-abrasive diamond wheels.

Main Results:

  • The proposed method successfully evaluated subsurface damage in ground fused silica.
  • Experimental results demonstrated good agreement with traditional SSD evaluation methods.
  • The technique proved to be consistent, indicating its practicality and effectiveness.

Conclusions:

  • The developed method offers a viable alternative for assessing subsurface damage in optical materials.
  • Simultaneous measurement of SSD depth and morphology enhances inspection efficiency.
  • The technique is suitable for routine quality control of optical components.