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The Gemini Planet Imager (GPI) is an integral field spectrograph (IFS) andcoronagraph that is one of the few current generation instruments optimized forhigh-contrast direct imaging of substellar companions. The instrument is in theprocess of being upgraded and moved from its current mount on the Gemini SouthObservatory in Cerro Pachon, Chile, to its twin observatory, Gemini North, onMauna Kea (a process colloquially dubbed 'GPI 2.0'). We present the designsthat have been developed for the part of GPI 2.0 that pertains to upgradingvarious optical components of the GPI coronagraphic system. More specifically,we present new designs for the apodizer and Lyot stop (LS) that achieve betterraw contrast at the inner working angle of the dark zone as well as improvedcore throughput while retaining a similar level of robustness to LSmisalignment. To generate these upgraded designs, we use our own publiclyavailable software package called APLC-Optimization that combines a commerciallinear solver (Gurobi) with a high contrast imaging simulation package (HCIPy)in order to iteratively propagate light through a simulated model of anapodized phase lyot coronagraph (APLC), optimizing for the best coronagraphperformance metrics. The designs have recently finished being lithographicallyprinted by a commercial manufacturer and will be ready for use when GPI 2.0goes on-sky in 2023.

GPI 2.0: Optical Designs for the Upgrade of the Gemini Planet Imager Coronagraphic system