Pulse energy enhancement by means of fiber Bragg gratings in actively Q-switched Tm3+-doped fiber lasers operating at 2050 nm and 2090 nmJulian Schneider, Patrick Forster, Dieter Panitzek, Dominik Lorenz, Clément Romano, Marc Eichhorn and Christelle KieleckEPJ Web Conf., 267 (2022) 02004DOI: https://doi.org/10.1051/epjconf/202226702004