Hollow lightpipe using a low refractive index inner layer
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United States of America Patent
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-
Feb 21, 1989
Grant Date -
N/A
app pub date -
Dec 29, 1987
filing date -
Dec 29, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A hollow lightpipe for conducting high power levels of CO.sub.2 laser light with low transmission losses. A highly reflective layer is formed on the inner surface of an elongated bendable metal housing. The material forming the highly reflective layer is chosen to have a complex index of refraction whose real part (n) is less than about 0.4. The thickness of the reflective layer need not be highly controlled, but must be sufficiently thick that it exhibits bulk absorption properties without being so thick that it cracks when the lightpipe is flexed. In a second embodiment, the transmission properties of the highly reflective layer can be enhanced by coating the reflective layer with a thin film of a dielectric materials such as ThF.sub.4 and Ge.
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