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Codoping Effects on the Laser Gain of Neodymium Activated Lithium Niobate Crystals

Congruent LiNbO 3 crystals activated with Nd 3+ (codoped with MgO, ZnO or Sc 2 O 3 ) have been characterised by spectroscopic and laser experiments. By optical absorption spectroscopy the distribution of Nd 3+ ions has been studied. The highest Nd incorporation was observed for Mg (5%), Nd(4%) melt concentrations, where saturation takes place. The optical quality of these crystals has been tested measuring the corresponding internal loss factor by laser experiments.