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Proceedings Paper

Use Of MIL-0-13830A For Specifying The Surface Quality Of Laser Optics
Author(s): H. E. Bennett
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Paper Abstract

The scratch/dig concept for specifying optical surface quality was first suggested by scientists at Eastman Kodak in 1944 and subsequently incorporated into a military specifi-cation (Mil Spec), the current version of which is MIL-0-13830A, revision L. The initial Kodak work suggested that the scratch width in microns equal the scratch number, but the scratch standards defined by the Mil Spec have a width in microns which is 0.1 times the scratch number, i.e., a number 60 scratch is 6 in ± 10% in width. Digs have an average width which is 10 times the dig number. When used as appearance standards -- the original intent -- the width is not critical. However, if the Mil Spec is used as a specification for laser optics, the width is important. When the surface damage mechanism is joule heating and the scratch or dig is absorbing, the damage threshold is directly related to defect width. The theoretical analysis and experimental evidence supporting this conclusion and the practice of using the Mil Spec for laser optics specification will be discussed.

Paper Details

Date Published: 3 September 1985
PDF: 4 pages
Proc. SPIE 0525, Measurement and Effects of Surface Defects & Quality of Polish, (3 September 1985); doi: 10.1117/12.946348
Show Author Affiliations
H. E. Bennett, Naval Weapons Center (United States)

Published in SPIE Proceedings Vol. 0525:
Measurement and Effects of Surface Defects & Quality of Polish
Lionel R. Baker; Harold E. Bennett, Editor(s)

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