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We review the design process, development, commissioning, on-sky performance, and first scientific results of all commissioned vAPPs. Using different liquid-crystal recipes to tune the retardance, different vAPPs operate with high efficiencies ( $ \sim 30$) between 1 µm and 5 µm. The efficiency, that is, the amount of light in these PSFs, depends on the retardance offset from a half-wave of the liquid-crystal retarder. The vAPP generates two coronagraphic point spread functions (PSFs) that cancel starlight on opposite sides of the PSF and have opposite circular polarization states. The vAPP is a geometric-phase patterned coronagraph that is inherently broadband, and its manufacturing is enabled only by direct-write technology for liquid-crystal patterns. Over the last decade, the vector-apodizing phase plate (vAPP) coronagraph has been developed from concept to on-sky application in many high-contrast imaging systems on 8 m class telescopes. 27, 8093 Zurich, SwitzerlandĢ2UK Astronomy Technology Centre, STFC, Blackford Hill, Edinburgh EH9 3HJ, UKĢ3LESIA, Observatoire de Paris, Université PSL, CNRS, Sorbonne Université, Université de Paris, 5 place Jules Janssen, 92195 Meudon, FranceĢ4STAR Institute, Université de Liège, Allée du Six Août 19c, B-4000 Liège, Belgium SW, Washington, DC 20375, USAĢ1Institute for Particle Physics and Astrophysics, ETH Zurich, Wolfgang-Paulistr. University Blvd., Tucson, Arizona 85719, USAġ1Subaru Telescope, National Astronomical Observatory of Japan, National Institutes of Natural Sciences (NINS), 650 North A‘ohōkū Place, Hilo, Hawaii 96720, USAġ2Astrobiology Center of NINS, 2-21-1, Osawa, Mitaka, Tokyo, 181-8588, Japanġ3NASA-Goddard Space Flight Center, Greenbelt, Maryland 20771, USAġ4Department of Physics, University of Notre Dame, South Bend, Indiana 46556, USAġ5Department of Astronomy, California Institute of Technology, 1200 East California Blvd., Pasadena, California 91125, USAġ6SRON Netherlands Institute for Space Research, Landleven 12, 9747AD Groningen, The Netherlandsġ7National Research Council of Canada Herzberg, 5071 West Saanich Road, Victoria, British Columbia V9E 2E7, Canadaġ8Department of Physics and Astronomy, University of Victoria, 3800 Finnerty Road, Victoria, British Columbia V8P 5C2, Canadaġ9Department of Astronomy and Astrophysics, University of California, Santa Cruz, 1156 High Street, Santa Cruz, California 95064, USAĢ0Naval Research Laboratory, Remote Sensing Division, 4555 Overlook Ave. Box 9513, 2300 RA Leiden, The NetherlandsĢSpace Telescope Science Institute, 3700 San Martin Drive, Baltimore, Maryland 21218, USAģAix-Marseille University, CNRS, CNES, LAM, Marseille, FranceĤSteward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, Arizona 85721, USAĥAnton Pannekoek Institute for Astronomy, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The NetherlandsĦCOPL, Département de physique, génie physique et optique, Université Laval, 2375, rue de la Terrasse, Québec, Quebec G1V 0A6, CanadaħDepartment of Electrical and Computer Engineering, North Carolina State University, Raleigh, North Carolina 27695, USAĨAstrophysics, Department of Physics, University of Oxford, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH, UKĩHarvard & Smithsonian | Center for Astrophysics, 60 Garden St., Cambridge, Massachusetts 02138, USAġ0College of Optical Sciences, University of Arizona, 1630 E. Note: Author names will be searched in the keywords field, also, but that may find papers where the person is mentioned, rather than papers they authored.ġLeiden Observatory, Leiden University, P.O.Use a comma to separate multiple people: J Smith, RL Jones, Macarthur.Use these formats for best results: Smith or J Smith.For best results, use the separate Authors field to search for author names.Use quotation marks " " around specific phrases where you want the entire phrase only.Question mark (?) - Example: "gr?y" retrieves documents containing "grey" or "gray".Asterisk ( * ) - Example: "elect*" retrieves documents containing "electron," "electronic," and "electricity".Improve efficiency in your search by using wildcards.Example: (photons AND downconversion) - pump.Example: (diode OR solid-state) AND laser.Note the Boolean sign must be in upper-case.
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