Experimental verification of a theoretical model of an active-cladding optical fiber fluorosensor

Sacharia Albin; Alvin L. Briant; Claudio Oliveira Egalon; Robert S. Rogowski; Juock S. Namkung

doi:10.1117/12.143563

30 April 1993 Experimental verification of a theoretical model of an active-cladding optical fiber fluorosensor

Sacharia Albin, Alvin L. Briant, Claudio Oliveira Egalon, Robert S. Rogowski, Juock S. Namkung

Proceedings Volume 1796, Chemical, Biochemical, and Environmental Fiber Sensors IV; (1993) https://doi.org/10.1117/12.143563
Event: Fibers '92, 1992, Boston, MA, United States

Abstract

Experiments were conducted to verify a theoretical model on the injection efficiency of sources in the cladding of an optical fiber. The theoretical results predicted an increase in the injection efficiency for higher differences in refractive indices between the core and cladding. The experimental apparatus used consisted of a glass rod 50 cm long, coated at one end with a thin film of fluorescent substance. The fluorescent substance was excited with side illumination, perpendicular to the rod axis, using a 476 nm Argon-ion laser. Part of the excited fluorescence was injected into the core and guided to a detector. The signal was measured for several different cladding refractive indices. The cladding consisted of sugar dissolved in water and the refractive index was changed by varying the sugar concentration in the solution. The results indicate that the power injected into the rod, due to evanescent wave injection, increases with the difference in refractive index which is in qualitative agreement with theory.

Citation Download Citation

Sacharia Albin, Alvin L. Briant, Claudio Oliveira Egalon, Robert S. Rogowski, and Juock S. Namkung "Experimental verification of a theoretical model of an active-cladding optical fiber fluorosensor", Proc. SPIE 1796, Chemical, Biochemical, and Environmental Fiber Sensors IV, (30 April 1993); https://doi.org/10.1117/12.143563

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KEYWORDS

Cladding

Refractive index

Glasses

Optical fibers

Waveguides

Thin films

Quartz

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