Waveguide Capillary Cell for Low-Refractive-Index Liquids

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Abstract:

We describe a waveguide capillary cell based on a fused-silica tube coated externally with a thin layer of a low-refractive-index ( n = 1.31) fluoropolymer. When filled with a transparent liquid of refractive index greater than that of the fluoropolymer, the cell is capable of transmitting light through total internal reflection. Loss below 1 dB/m is demonstrated throughout much of the visible region for a 530- mu m-i.d., 660- mu m-o.d. cell filled with water.

Keywords: WAVEGUIDE CAPILLARY CELL LIQUID-CORE OPTICAL FIBER VISIBLE SPECTROSCOPY

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/0003702971939109

Publication date: October 1, 1997

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