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Proceedings Paper

Characterization of subsurface damage in glass and metal optics
Author(s): Robert S. Polvani; Christopher J. Evans
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Paper Abstract

Even unusual care in polishing leads to optics with somewhat damaged working faces. The question is to what degree? the physical nature of this damage depeids on the ductility or plasticity of the constniction material. Glassy materials (glass brittle metals and semiconductors) fracture while ductile materials work harden. Beryffium suffers from both modes. To physically model damage we oversimplify and picture a surface layer with two features a depth and an intensity of the IvjIk property changes. A statistical alternative to intensity is the visible flaw density. We use a variety of analytical mathods but mainly x-ray diffraction metallography and instrumented microindentation and frequently use them in combination. Our problem is to develop a general hasis and means of characterizing subsurface damage. To illustrate the diversity difficulty and our progress with the problem we will report experiences with a variety of examples. The talk will consider damage in ductile regimeN ground classically polished fused silica BK-7 pyrex optics esuperu polished BK-i precision ground silicon nitride and aluminaceramics and precision CBN turned beryllium.

Paper Details

Date Published: 1 June 1991
PDF: 1 pages
Proc. SPIE 1441, Laser-Induced Damage in Optical Materials: 1990, (1 June 1991); doi: 10.1117/12.57211
Show Author Affiliations
Robert S. Polvani, National Institute of Standards and Technology (United States)
Christopher J. Evans, National Institute of Standards and Technology (United States)

Published in SPIE Proceedings Vol. 1441:
Laser-Induced Damage in Optical Materials: 1990
Harold E. Bennett; Lloyd L. Chase; Arthur H. Guenther; Brian Emerson Newnam; M. J. Soileau, Editor(s)

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