Abstract

The energy transfer from Tm3+ to Nd3+ was explored in Tm,Nd:KPb2Cl5 for sensitization of a possible 5μm Nd laser. Evidence for an efficient energy transfer from Tm3+ to Nd3+ under 785 nm excitation was obtained through monitoring changes in (i) the Tm3+ decay behavior and (ii) the 5μm emission intensity arising from the I1124I924 transition of Nd3+ ions. The quantum efficiency of the 5μm emission from Nd3+ was estimated to be approximately four times greater in Tm,Nd:KPb2Cl5 compared with Nd:KPb2Cl5. Sensitization of Nd3+ with Tm3+ in KPb2Cl5 promises a significant increase in the maximum achievable slope efficiency of a potential 5μm Nd laser.

© 2005 Optical Society of America

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