Hannover 2010 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 54: Laser Applications: Optical Measurement Technology I

Q 54.1: Vortrag

Donnerstag, 11. März 2010, 14:00–14:15, F 342

Measurement of submicrometer diameters of tapered optical fibres using harmonic generation — •Ulrich Wiedemann, Konstantin Karapetyan, Dimitri Pritzkau, Cristian Dan, Wolfgang Alt, and Dieter Meschede — Institut für Angewandte Physik, Wegelerstr. 8, 53115 Bonn

For applications of subwavelength-diameter optical fibres in nonlinear optics it is important to know the submicrometer fibre diameter precisely. We demonstrate a new technique for optical measurement of the diameter based on second- and third-harmonic generation with an accuracy of a few percent. In order to obtain the harmonic light, inter-modal phase matching has to be fulfilled. We find that the phase-matching condition allows us to unambiguously deduce the fibre diameter from the wavelength of the harmonic light.