Laser cooling of ytterbium-doped silica glass. - Mobini, Esmaeil; Rostami, Saeid; Peysokhan, Mostafa; Albrecht, Alexander; Kuhn, Stefan; Hein, Sigrun; Hupel, Christian; Nold, Johannes; Haarlammert, Nicoletta; Schreiber, Thomas; Eberhardt, Ramona; Tünnermann, Andreas; et al. (Communications Physics, 2020)