Beam combination schemes and technologies for the Planet Formation   Imager (PFI)
  The Planet Formation Imager (PFI) initiative aims at developing the next generation large scale facility for imaging astronomical optical interferometry operating in the mid-infrared. Here we report on the progress of the Planet Formation Imager Technical Working Group on the beam-combination instruments. We will discuss various available options for the science and fringe-tracker beam combination instruments, ranging from direct imaging, to non-redundant fiber arrays, to integrated optics solutions. Besides considering basic characteristics of the schemes, we will investigate the maturity of the available technological platforms at near- and mid-infrared wavelengths. 
Stefano Minardi, Sylvestre Lacour, Jean-Philippe Berger, Lucas   Labadie, Robert R. Thomson, Chris Haniff, Michael Ireland
astro-ph.IM