Rare earth-doped glass whispering gallery mode micro-lasers Gabriele Frigenti, Simone Berneschi, Daniele Farnesi, Stefano Pelli, Giancarlo C. Righini, Silvia Soria, Yannick Dumeige, Patrice Féron, Davor Ristić, Francesco Prudenzano et al. (2 more) Eur. Phys. J. Plus, 138 8 (2023) 679 Published online: 03 August 2023 DOI: 10.1140/epjp/s13360-023-04275-9