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Q: Quantenoptik und Photonik

Q 39: Nichtlineare optische Effekte & Lichtquellen

Q 39.9: Vortrag

Dienstag, 8. März 2005, 12:45–13:00, HU 2014a

Amplitude and Phase Coherence Properties — •Diana Türke, Sebastian Pricking, and Harald Giessen — Institut für Angewandte Physik, Universität Bonn, Wegelerstraße 8, D-53115 Bonn

The coherence properties of supercontinuum trains generated in tapered fibers as well as in photonic crystal fibers have become a demanding topic, as they are the key issue when trying to compress visible light pulses below a one femtosecond pulse duration. Pulse compression based on a pulse shaper is needed to adjust the phases of the different spectral components with respect to each other in order to achieve the required flat phase. Therefore, the pulse-to-pulse phase noise of the spectral components is a very critical parameter. Our approach is gaining direct experimental access to the phase noise by measuring the pulse-to-pulse coherence and the amplitude noise of the supercontinuum by using an asymmetric Michelson interferometer with different arm-length to interfere subsequent pulses.

Additionally, the contribution of amplitude noise to the visibility of the spectral interference pattern is investigated.

We find a large degree of coherence in a wide range of spectral components for certain input pulse conditions.