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An Integral Field Unit (IFU) based on image-slicers has been added to theGREGOR Infrared Spectrograph (GRIS). This upgrade to the instrument makespossible 2D spectropolarimetry in the near-infrared by simultaneously recordingthe full Stokes profiles of spectral lines (in a given spectral interval) atall the points in the field of view. It provides high-cadencespectropolarimetric observations at the instrument's high spatial resolutionand high polarization sensitivity at the GREGOR solar telescope. The IFU isideal for observing the polarized spectrum of fast-evolving solar features athigh spatial and spectral resolutions. The high observing cadence opens thepossibility of time-series observations. The analysis of observations to thislevel of accuracy is essential for understanding the complex dynamics andinteractions of solar plasma and magnetic fields. The image slicer of the IFUhas eight slices of width 100 micron, covering a total field of view of 6" x3". It was designed and built within the framework of the European projectsSOLARNET and GREST, as a prototype for future instruments of the European SolarTelescope (EST) and was integrated into GRIS. After two commissioning campaignsin 2017 and 2018, the IFU was finally installed at the end of September 2018and offered to all observers who use the telescope.

First light of the Integral Field Unit of GRIS on the GREGOR solar telescope