High-Power ZBLAN Glass Fiber Lasers: Review and Prospect
Figure 10
Partial energy level diagram of Pr3+ ion in ZBLAN related to upconversion laser emissions (Partial energy level diagram of Yb3+ ion is also plotted to indicate pump absorption and energy transfer from Yb3+ to Pr3+). Pump absorption transitions are indicated with green upward arrows. Radiative emission transitions are indicated with blue downward arrows.
