Michael Eckerle, Frieder Beirow, Tom Dietrich, Frederik Schaal, Christof Pruss, Wolfgang Osten, Nicolas Aubry, Matthieu Perrier, Julien Didierjean, Xavier Délen, and others. High-power single-stage single-crystal Yb: YAG fiber amplifier for radially polarized ultrashort laser pulses. Applied Physics B, (123)5:139, Springer, 2017. [PUMA: radial amplifier from:tomdietrich thindisklaser singlecrystalfiber polarization]