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16 April 2019 OH diffusion effects at preparation of antiresonant hollow core fibers
J. Kobelke, J. Bierlich, K. Schuster, A. Lorenz, A. Hartung, A. Schwuchow, K. Wondraczek, T. Frosch, M. A. Schmidt
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Proceedings Volume 11029, Micro-structured and Specialty Optical Fibres VI; 1102904 (2019) https://doi.org/10.1117/12.2506589
Event: SPIE Optics + Optoelectronics, 2019, Prague, Czech Republic
Abstract
We report on OH diffusion effects at preparation of hollow core fibers with large central hexagonal and square shaped cores. The fibers with up to 30 μm central hole diameter are suitable for chemical sensor applications, especially for gases. We demonstrate the single mode guidance at selective bands in the UV, VIS and NIR region. Key feature of low loss in specific spectral windows of such fiber structures is the control of thickness and homogeneity of the web bridges. The fibers achieve a minimum loss of 2 dB/m and effective single mode propagation in the wavelength range between 270 nm and 1500 nm. The thinness of the bridges beneath one micrometer results in a deep impregnation of OH by diffusion from the cavities during thermal processing, e.g. fiber drawing. Up to 1000 ppm by weight of OH had been measured in the silica web surrounding the hollow core. Obviously, the OH sources are atmospheric humidity and condensed water originating from using a hydrogen-oxygen torch at final preform fabrication. The paper shows the good agreement between OH diffusion simulation and experimental observation of OH impregnation in the hollow core web.
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J. Kobelke, J. Bierlich, K. Schuster, A. Lorenz, A. Hartung, A. Schwuchow, K. Wondraczek, T. Frosch, and M. A. Schmidt "OH diffusion effects at preparation of antiresonant hollow core fibers", Proc. SPIE 11029, Micro-structured and Specialty Optical Fibres VI, 1102904 (16 April 2019); https://doi.org/10.1117/12.2506589
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KEYWORDS
Diffusion
Silica
Optical fibers
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