Abstract

Light leakage between fibers for the particular case of their use with Lambertian emitters is discussed. The associated problems of the degree of optical contact between the fiber ends and the emitting source, and their effects on the over-all transmitting efficiency are considered in detail and results are presented for several representative emitters. A transmission theory of fibers based on meridional ray considerations alone is derived and shown to be adequate for high numerical aperture fibers. The general expressions, from which the simplified theory is deduced, are given in an appendix to the paper. Results are presented for an experimental system which has been constructed and tested. These results demonstrate that photometric gains of up to 40 or 140 are available when using a fiber optics cathode-ray tube in place of a standard tube and unit magnification f/1 and f/2.8 lens systems, respectively. The fusion processes entailed in the construction of such tubes and similar devices are considered. Fibers with a numerical aperture of 1.17 which retain their circular cross section during these processes are described.

© 1961 Optical Society of America

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Equations (20)

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