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A novel concept of a liquid core lightguide in cylindrical geometry is presented. The coating of a hollow core glass tube with Teflon AFR leads together with a liquid filled core to such a guide. Effective coupling was obtained and low losses were observed. Using this liquid core guide as an optical cell in a spectrometer a significant increase in sensitivity, depending on the length of the guide, may be obtained.
Peter Dress andHilmar Franke
"Optical fiber with a liquid H2O core", Proc. SPIE 2686, Integrated Optics and Microstructures III, (25 March 1996); https://doi.org/10.1117/12.236134
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Peter Dress, Hilmar Franke, "Optical fiber with a liquid H2O core," Proc. SPIE 2686, Integrated Optics and Microstructures III, (25 March 1996); https://doi.org/10.1117/12.236134