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We present the innovative macro-slicer optical and opto-mechanical designsfor the third-generation Mid-resolution InfraReD Astronomical Spectrograph(MIRADAS) instrument for the 10.4m Gran Telescopio Canarias (GTC) in the 1-2.5$\mu$m bandpass. MIRADAS uses up to 12 cryogenic, fully steerable probes toselect simultaneous targets in a 5 arcminute field of view. The spectrographmodule is a cross-dispersed echelle spectrograph. The macro-slicer iseffectively a stack of six advanced image slicer Integral Field Units (IFUs)such as FRIDA or FISICA, and like other IFUs designed and built at theUniversity of Florida by our group, uses a `bolt-and-go' approach to minimizethe difficulty in alignment and maximize robustness. Like other advanced imageslicer IFUs, there are three sets of mirrors that work together togeometrically rearrange the loosely packed inputs from the probe arms into atightly packed pseudo-slit. The macro-slicer also passively keeps the spectralresolution of MIRADAS fixed at $R>20,000$ in seeing from 1.2 arcseconds down to0.4 arcseconds, (typical observing conditions at GTC).

Optical and Opto-Mechanical Design of a Novel "Macro" Image Slicer for the MIRADAS Instrument