New materials for UV, VIS and mid-IR solid state lasers based on the rare earth doped double chloride crystals (TR/sup 3+/:KPb/sub 2/Cl/sub 5/)

摘要

Laser action of the TR:KPC (KPb/sub 2/Cl/sub 5/) crystals was achieved with Dy at 2.4 /spl mu/m. In the present work we continued studying this new systems based on TR/sup 3+/ doped chloride matrix suitable for diode-pumped lasers. We studied the optical spectra and luminescence kinetics, calculated radiative and nonradiative transition probabilities, considered up-conversion processes and possibility of energy transfer from exciton matrix band to TR/sup 3+/ ions. Intensive absorption band in UV spectral range (/spl lambda/>340 nm) associated with excitonic absorption formed by 6s/spl rarr/6p transitions in Pb/sup 2+/ ion. TR/sup 3+/ doped KPC crystals exhibit strong absorption bands in UV and IR.