Abstract
The 18.7 at% Nd:Ca 8.53K 1.09La 0.95(VO 4) 7 crystal with dimensions up to ∅ 22 mm×30 mm was grown by the Czochralski method. The X-ray powder diffraction pattern of Nd:Ca 8.53K 1.09La 0.95(VO 4) 7 crystal confirms that the as-grown crystal is isostructural with pure Ca 9La(VO 4) 7 crystal. The effective segregation coefficients of Nd 3+ and K + ions in the crystal were measured to be about 1.21 and 0.73, respectively. The hardness of Nd:Ca 8.53K 1.09La 0.95(VO 4) 7 crystal is about 358.3 VDH. The qualitative frequency-doubling experiment shows that the doping of K + ion can help reduce the scattering of frequency-doubling light. The spectroscopic study of Nd 3+ in Nd:Ca 8.53K 1.09La 0.95(VO 4) 7 crystal was performed, and the polarized absorption and fluorescence spectra were analyzed based on Judd–Ofelt theory, which exhibits that the π-polarized absorption and stimulated emission cross sections are 4.41×10 −20 cm 2 with an FWHM 11 nm at 810 nm and 1.61×10 −19 cm 2 at 1066 nm, respectively. The fluorescence lifetime is 128 μs at room temperature. All the results indicate that the Nd:Ca 8.53K 1.09La 0.95(VO 4) 7 crystal may be a highly efficient laser material and thus a promising candidate of self-frequency-doubling laser material.
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