![]() Comment: 11 pages, 5 figures, to be published in Proc. We find that fibres with as few as ~5 guided modes have qualitatively different behaviour to single-mode fibres and share a number of the beneficial characteristics of multi-mode fibres. Here we describe a project to explore this topic in detail, and present initial results on coupling light into single and few-mode fibres at the diffraction limit. While astronomical instruments have largely solved the problem of coupling light into multi-mode fibres this is largely unexplored territory for few-mode and single-mode fibres. ![]() We envisage the largest gains in astrophotonics will come from instruments that operate with single or few-mode fibres in the diffraction limited or near diffraction limited regimes. These new photonic mechanisms are not well matched to conventional multi-mode fibres and are best fed with single or few-mode fibres. Important applications include photonic OH suppression at near-infrared wavelengths, and integrated photonic spectroscopy. The burgeoning field of astrophotonics explores the interface between astronomy and photonics. Comment: 12 pages, 10 figures, SPIE conference proceedings, Marseille, 2008 The scientific applications range from solar system studies and spectroscopy of exoplanets to the dynamics of stars and gas in the central regions of the Milky Way and other nearby galaxies. In both cases, the instrument incorporates imaging interferometry with integral field spectroscopy, an ideal combination for detailed studies of astronomical objects down to below 10mas angular resolution in the near-infrared. Two instrument concepts have been studied in detail: a microlens array IFU with a spectrograph built entirely inside LINC (the LIINUS approach), and a lenslet+fibers IFU feeding an external spectrograph (the SERPIL approach). This instrument will expand the capabilities of the currently-under-construction interferometric camera LINC-NIRVANA with spectroscopy by means of an integral field unit (IFU) located inside the LINC cryostat. ![]() ![]() #DOUBLE PUPIL DRIVERS#We present two design concepts and the science drivers of a proposed near-infrared interferometric integral field spectrograph for the LBT. ![]()
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