Heidelberg 2015 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 62: Poster: Quantum Optics and Photonics III

Q 62.106: Poster

Thursday, March 26, 2015, 17:00–19:00, C/Foyer

Photonic Lanterns - Characterisation for applications in Astrophotonics — •Katjana Ehrlich, Dionne Haynes, Jean-Christophe Olaya, Roger Haynes, and Martin M. Roth — innoFSPEC, Leibniz-Institut für Astrophysik (AIP), Potsdam, Deutschland

On the one hand, seeing-limited star light from a telescope focal plane is injected into multi-mode fibres because of the coupling efficiency. On the other hand, fibre-based integrated photonics work in the single-mode regime and enable potential applications like spectral filtering with fibre Bragg gratings, integrated photonic spectrographs and fibre scrambler for high resolution spectroscopy. Photonic lanterns are devices that perform such a multi-mode (MM) to single-mode (SM) conversion. They are based on a taper transition which couples light between one multi-mode fibre to several single-mode fibres. The investigated device consists of 61 single-mode fibres. We study the transmission through a MM-SM conversion in high- and low-resolution experiments and find that the spectral information of the source is preserved and that photonic lanterns act as stable low noise systems regarding changes in the position of the input spot. We also spliced together two photonic lanterns and show that this MM-SM-MM converter generates less noise under mechanical perturbation. In the near field light distribution the photonic lanterns acts as an improved mode scrambler in comparison with a standard step-index multi-mode fibre.