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Proceedings Paper

Source numerical aperture control for efficient light emission from notched side-lighting fiber optics
Author(s): Sheldon Sillyman; Kenneth K. Li; Seiji Inatsugu
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Paper Abstract

One of the important properties to the emission of light from a side lighting waveguide using a notched cladding and solid core is the numerical aperture of the source at the input of the fiber core. Reducing the emission angle of light entering the fiber allows light transmission further down the fiber so that it becomes available for side emission at an increased distance from the source. This allows side-lighting fibers to be made longer and more uniform. Utilizing this effect, the fiber can be notched in a controlled manner that efficiently converts the source light accepted into the waveguide into a side-emitted light that is distributed uniformly over the length of the fiber. A detailed optical analysis of this system will be presented with evaluation of the effect on the resulting side light emission as the source light parameters are adjusted. The analysis will include discussions on the trade-off associated with the reduced source efficiencies at lower etendue values and the optimization of the system as a whole. Experimental results using a metal halide arc lamp with dual parabolic reflector as the source and solid-core polymer fiber of 12-18 mm diameter with customized notched cladding will be presented and discussed.

Paper Details

Date Published: 29 September 2004
PDF: 9 pages
Proc. SPIE 5529, Nonimaging Optics and Efficient Illumination Systems, (29 September 2004); doi: 10.1117/12.559858
Show Author Affiliations
Sheldon Sillyman, Wavien, Inc. (United States)
Kenneth K. Li, Wavien, Inc. (United States)
Seiji Inatsugu, Wavien, Inc. (United States)


Published in SPIE Proceedings Vol. 5529:
Nonimaging Optics and Efficient Illumination Systems
Roland Winston; R. John Koshel, Editor(s)

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