Abstract
La2CaB10O19 (LCB) is a new NLO crystal, in which Nd3+ can be doped with different concentrations to be self-frequency doubling crystals. We obtained seven LCB crystals with different Nd3+ concentrations grown by flux method. Refractive indices, absorption spectra and fluorescence spectra of the seven LCB crystals with various Nd3+ doping concentrations have been measured and evaluated. It has been found that the 5mol% Nd doped LCB crystal is most appropriate to be a laser material, by fitting the absorption spectrum with the Judd–Ofelt theory, radiative lifetime τr of Nd3+ in the 5mol% Nd doped LCB crystal is determined to be 237.8μs. For the 5mol% Nd doped LCB crystal, the absorption cross section at 799nm and the emission cross section at 1050nm are 4.52×10−20 and 1.29×10−19cm2, respectively. The measured fluorescence lifetime τf of the 5mol% Nd doped LCB crystal is 85μs and its quantum efficiency is 35.7%.
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