We report the first demonstration of superbroadband emission extending from 1.30 to 1.68 μm in praseodymium(Pr3+)-erbium(Er3+) codoped fluorotellurite glasses under 488 nm excitation. This superbroad near-infrared emission is contributed by the Pr3+:1D2→1G4and Er3+:4I13/2→4I15/2transitions which lead to emissions located at 1.48 and 1.53 μm, respectively. The quenching of the Pr3+emission resulted from the cross relaxation [1D2,3H4]→[1G4,3F3,4] was effectively compensated by the codoping of Er3+. The results suggest that, other than the heavy-metal and transition-metal elements of active bismuth (Bi), nickel (Ni), chromium (Cr), etc., Pr3+-Er3+codoped system is a promising alternative for the broadband near-infrared emission covering the expanded low-loss window.
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics