Hollow lightpipe and lightpipe tip using a low refractive index inner layer
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United States of America Patent
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Apr 9, 1991
Issued Date -
N/A
app pub date -
Feb 17, 1989
filing date -
Dec 29, 1987
priority date (Note) -
Expired
status (Latency Note)
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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 material such as ThF.sub.4 and Ge. By appropriate changes in the geometry of the lightpipe, it can also serve as a tip for use with an optical conduit, such as an optical fiber suitable for transmission of light produced by a YAG laser.
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