Use Of MIL-0-13830A For Specifying The Surface Quality Of Laser Optics

H. E. Bennett

doi:10.1117/12.946348

3 September 1985 Use Of MIL-0-13830A For Specifying The Surface Quality Of Laser Optics

H. E. Bennett

Proceedings Volume 0525, Measurement and Effects of Surface Defects & Quality of Polish; (1985) https://doi.org/10.1117/12.946348
Event: 1985 Los Angeles Technical Symposium, 1985, Los Angeles, United States

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.

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H. E. Bennett "Use Of MIL-0-13830A For Specifying The Surface Quality Of Laser Optics", Proc. SPIE 0525, Measurement and Effects of Surface Defects & Quality of Polish, (3 September 1985); https://doi.org/10.1117/12.946348

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