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Q: Fachverband Quantenoptik und Photonik

Q 54: Poster 3

Q 54.45: Poster

Donnerstag, 15. März 2012, 16:30–19:00, Poster.I+II

Design considerations for an optical microfibre fabrication machine — •Christian Lützler, Marcel Spurny, Wolfgang Alt, and Dieter Meschede — Institut für Angewandte Physik, Universität Bonn

Due to their high light confinement and strong evanescent field, optical microfibres are ideal for nonlinear optics, surface spectroscopy and interferometric sensing. The shape of both waist and tapered sections determines the optical properties of the microfibre, in particular surface intensity, adiabaticity and number of guided modes. A heat-and-pull apparatus is used to produce microfibres from standard diameter fibres. Applications which are sensitive to the exact shape of the optical fibres, e.g. interferometric sensing, showed that the microfibres obtained from a previous pulling machine [1] do not fully meet the expectations in terms of mode guidance, shape accuracy and reproducibility.

Our poster shows both requirements on the mechanics of a microfibre fabrication machine and indicates critical points during fabrication process. Possible reasons for the discrepancy between obtained and desired shape of the optical microfibres are illustrated. These are, among others, the inertia of the employed translation stages and the influence of the hydrogen-oxygen burner which is used as a heat source. The new fibre pulling machine, which is built under these design considerations at the University of Bonn, is presented.

[1] F. Warken, A. Rauschenbeutel und T. Bartholomäus, "Fiber pulling profits from precise positioning", Photonics Spectra 42, 3, 73 (2008).