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Q: Fachverband Quantenoptik und Photonik

Q 43: Laseranwendungen und Photonik 2

Q 43.2: Vortrag

Mittwoch, 16. März 2011, 16:45–17:00, SCH A118

Single optical microfibre interferometer — •Konstantin Karapetyan, Wolfgang Alt, Fabian Bruse, and Dieter Meschede — Institut für Angewandte Physik, Universität Bonn, Wegelerstr. 8, 53115, Bonn, Germany

Applications of optical microfibres (OMF)—optical fibres with a diameter on the order of 100...1000 nm operating in the strong guiding regime—have been proposed for evanescent field spectroscopy, atom trapping, nonlinear optics, and microparticle manipulation. Interferometers with an OMF in one or both arms have also been demonstrated. We present a single OMF-based interferometer. This device uses the down-taper of an OMF as a beam splitter and the up-taper as a beam recombiner, similar to a Mach-Zehnder interferometer. The two arms are realized here by the two lowest circular modes of the OMF, having different propagation constants. Due to their different mode field diameters, they experience specific absorptive and dispersive changes from materials in the evanescent field. We explain the design and manufacturing of such devices and show how they can be applied to a variety of experiments including the sensing of temperature, pressure and stretching, simultaneous measurement of absorption and dispersion of liquids, adsorbed and dissolved molecules, and free atoms.