Mechanism of the blue up-conversion in tm~3+/Nd~3+ -doped calcium aluminate glasses

摘要

Blue up-conversion fluorescence from the Tm~3+:~1G_4→~3H_6 (480 nm) transition has been observed from calcium alumi- nate glass codoped with Tm~3+/Nd~3+. The mechanism for the up-conversion process consists of a two-photon process. An excitation beam with a wavelength of 791 nm first Excites Tm~3+ to the ~3H_4 level, ehre Tm~3+ again absorbs The 1060 nm emission from Nd~3+:~4F_3/2→~4I_11/2 to attain the Tm~3+:~1G_4 level.