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Proceedings Paper

History of and potential for optical bonding agents in the visible
Author(s): James T. Magyar
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Paper Abstract

Nature was the original producer of optical coupling agents. Canada Balsam, the sap from a balsam tree, when distilled and filtered, yielded an extremely viscous bonding agent for optical elements. At moderate temperatures, Canada Balsam was an almost ideal bonding agent. It had a refractive index of approximately 1.5, transmitted light in wave lengths from 350 millimicrons to over 1 micron in very high per— centages and could fill minor differences between the surfaces of a crown and flint element. However, "moderate temperatures" was the problem area. In microscopes or telescopes that would be protected from severe temperatures, Canada Balsam performed just fine. But in fire control systems in tanks during desert warfare or optical systems in high altitude aircraft, Balsam thinned in high temperatures and crazed in low. World War II drove these facts home very clearly.

Paper Details

Date Published: 1 November 1991
PDF: 4 pages
Proc. SPIE 1535, Passive Materials for Optical Elements, (1 November 1991); doi: 10.1117/12.48303
Show Author Affiliations
James T. Magyar, EMS Acquisition Corp. (United States)

Published in SPIE Proceedings Vol. 1535:
Passive Materials for Optical Elements
Gary W. Wilkerson, Editor(s)

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