Pollnau, M.Laversenne, L.Limberger, H.G.Bigotta, S.Toncelli, A.Tonelli, M.2009-07-202009-07-202009-07-202004https://infoscience.epfl.ch/handle/20.500.14299/41555[OFD]Superquadratic behavior of upconversion luminescence transients in rare-earth-ion doped laser crystalstext::conference output::conference proceedings::conference paper