Scratch Forensics

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Scratches on optical components which are formed during fabrication, cleaning, handling and end-use, are widespread and almost always detrimental. The impact of scratches on the end-use of the optic includes increased optical scatter, reduced system performance, and reduced strength. In the case of optics used in high intensity laser applications, prevention of scratches is paramount because they are closely associated with laser damage. Evaluation of the characteristics (dimensions, location on optic, shape, and orientation) of a scratch can serve a powerful tool to identify the cause of the scratch and lead to mitigations to prevent their reoccurrence. It is likely ... continued below

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PDF-file: 7 pages; size: 0.6 Mbytes

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Suratwala, T I; Miller, P E; Feit, M D & Menapace, J A July 9, 2008.

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Description

Scratches on optical components which are formed during fabrication, cleaning, handling and end-use, are widespread and almost always detrimental. The impact of scratches on the end-use of the optic includes increased optical scatter, reduced system performance, and reduced strength. In the case of optics used in high intensity laser applications, prevention of scratches is paramount because they are closely associated with laser damage. Evaluation of the characteristics (dimensions, location on optic, shape, and orientation) of a scratch can serve a powerful tool to identify the cause of the scratch and lead to mitigations to prevent their reoccurrence. It is likely that opticians have used such techniques for hundreds of years. In recent years, by applying techniques of fracture mechanics and tribology, several new semi-quantitative rules-of-thumb have been developed allowing one to estimate the size and shape of the scratch inducing asperity or rogue particle, the load on the particle, the depth of the fractures in the scratch, and properties of material housing the rogue particle. The following discussion reviews some these techniques, which as a whole, we refer to as 'Scratch Forsenics'.

Physical Description

PDF-file: 7 pages; size: 0.6 Mbytes

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  • Journal Name: Optics & Photonics News: Optical Engineering Column, vol. 19, no. 9, September 1, 2008, pp. 12-15; Journal Volume: 19; Journal Issue: 9

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  • Report No.: LLNL-JRNL-405503
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 944313
  • Archival Resource Key: ark:/67531/metadc893025

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • July 9, 2008

Added to The UNT Digital Library

  • Sept. 27, 2016, 1:39 a.m.

Description Last Updated

  • Dec. 8, 2016, 10:04 p.m.

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Suratwala, T I; Miller, P E; Feit, M D & Menapace, J A. Scratch Forensics, article, July 9, 2008; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc893025/: accessed December 11, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.