Integral Field Spectroscopy (IFS) provides a spectrum simultaneously for each spatial sample of an extended two-dimensional
field. Basically, the IFS is located in a telescope focal plane and is composed by an Integral Field Unit (IFU
or image slicer) and a spectrograph. The IFU acts as a coupler between the telescope and the spectrograph by
reformatting optically a rectangular field into a quasi-continuous pseudo-slit located at the entrance focal plane of the
spectrograph. The Integral Field Units (IFUs) are presently limited either by their cost/risk (when manufactured with
classical glass polishing techniques) or by their performances (when constituted by metallic components).
Recent innovative methods, developed conjointly by LAM (Laboratoire d'Astrophysique de Marseille, France) and
WinLight Optics (Marseille, France), allow reaching high performances (accurate roughness, sharp edges, surface form,
etc.) with standard glass manufactured components while saving costs and time by an order of magnitude compared with
classical techniques. Last developments (in term of design and manufacturing) and applications are presented in details
in this article.© (2008) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.