Scientists at the Institut für Strahlwerkzeuge (IFSW) have demonstrated the generation of kW-class continuous-wave radially polarized laser radiation from an Yb:LuAG thin-disk laser (TDL).
Output powers of up to 980 W were achieved with an optical efficiency of 50.5% with respect to the incident pump power of the TDL . The degree of radial polarization was measured to be 95.5% at the maximum output power. This was achieved by the integration of a new generation of broadband, large-area grating-waveguide mirror with unprecedented high polarization discrimination as the end-mirror in the TDL resonator.
Contact: Marwan Abdou Ahmed
 Tom Dietrich, Martin Rumpel, Frieder Beirow, Cherry May Mateo, Christof Pruss, Wolfgang Osten, Marwan Abdou Ahmed, and Thomas Graf, „Thin-disk oscillator delivering radially polarized beams with up to 980 W of CW output power”, Optics Letters 43 (6), 1371-1374 (March 2018).