Abstract
We report on the bluish green upconversion luminescence of niobium ions doped silicate glass by a femtosecond laser irradiation. The dependence of the fluorescence intensity on the pump power density of laser indicates that the conversion of infrared irradiation to visible emission is dominated by three-photon excitation process. We suggest that the charge transfer from O2-to Nb5+can efficiently contribute to the bluish green emission. The results indicate that transition metal ions without d electrons play an important role in fields of optics when embedded into silicate glass matrix.
| Original language | English |
|---|---|
| Pages (from-to) | 6502-6506 |
| Number of pages | 5 |
| Journal | Optics Express |
| Volume | 16 |
| Issue number | 9 |
| DOIs | |
| State | Published - 28 Apr 2008 |
| Externally published | Yes |