Abstract
Strong blue emissions have been observed in fluoride crystals, such as , , and , codoped with and when excited into the state at ∼780 nm. Energy transfer from to ions followed by the transfer from to was demonstrated to be responsible for the upconversion process. A pumping scheme is proposed based on this upconversion mechanism for blue-laser applications using these materials.
- Received 2 December 1994
DOI:https://doi.org/10.1103/PhysRevB.51.9298
©1995 American Physical Society