| Abstract
| - The growth of rare-earth (RE = Nd, Tb, Ho, Er, Tm,and Yb) doped KTiOPO4 (KTP) singlecrystals from high-temperature solutions[K2O−P2O5−TiO2−RE2O3(or Tb4O7)] was investigated. The concentration regions of crystallization of RE-dopedKTP, the maximum (critical) RE concentrations in the solution without losing the KTP phase andthe correspondingupper limit of RE ions incorporated into the KTP lattice were obtainedexperimentally. Thecrystallization regions of RE-doped KTP are significantly narrower thanthe region of undoped KTP. Above a certain critical RE concentration in thesolution, RE phosphatephases crystallize. The highest concentration of RE in the crystalis in the range 50−600ppm and strongly depends on the RE ionic radius. Some doublesubstitutions with Ndand a codopant element can significantly change this concentration.In addition, RE-dopedKTP single crystals were grown by the top seeded solution growth (TSSG)technique, andtheir experimental conditions were compared with those of undoped KTPsingle-crystalgrowth. Optical absorption spectra for Ho-, Er-, and Tm-doped KTPwere obtained anddiscussed.
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