Effective sensitization of Dy:H energy level by Tm ions in KPbBr crystal for 4.3 µm lasers.

To the best of our knowledge, this is the first study to investigate the use of Tm to sensitize the Dy ion and enhance the ∼4.3 µm emission from Dy:H → H in the KPbBr (KPB) crystal. The ∼4.

Efficient Ho:LuLiF4 laser diode-pumped at 1.15 μm.

We report the first laser operation based on Ho(3+)-doped LuLiF(4) single crystal, which is directly pumped with 1.15-μm laser diode (LD). Based on the numerical model, it is found that the "two-for-one" effect induced by the cross-relaxation plays an important role for the laser efficiency.