Source numerical aperture control for efficient light emission from notched, side-lighting fiber optics

Sheldon Sillyman; Kenneth K. Li; Seiji Inatsugu

doi:10.1117/12.559858

29 September 2004 Source numerical aperture control for efficient light emission from notched side-lighting fiber optics

Sheldon Sillyman, Kenneth K. Li, Seiji Inatsugu

Author Affiliations +

Proceedings Volume 5529, Nonimaging Optics and Efficient Illumination Systems; (2004) https://doi.org/10.1117/12.559858
Event: Optical Science and Technology, the SPIE 49th Annual Meeting, 2004, Denver, Colorado, United States

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.

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Sheldon Sillyman, Kenneth K. Li, and Seiji Inatsugu "Source numerical aperture control for efficient light emission from notched side-lighting fiber optics", Proc. SPIE 5529, Nonimaging Optics and Efficient Illumination Systems, (29 September 2004); https://doi.org/10.1117/12.559858

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