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Comparative study on the spectroscopic properties of Nd:GdVO4 and Nd:YVO4 with hybrid process

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2 Author(s)
Sato, Y. ; Laser Res. Center, Inst. for Molecular Sci., Okazaki, Japan ; Taira, T.

We have proposed a hybrid procedure for determining spectroscopic parameters for uniaxial solid-state laser crystals. Using our procedure, the spectroscopic properties of Nd:GdVO4 were evaluated and compared to those of Nd:YVO4. As a result, the peaks of absorption and stimulated emission cross sections of Nd:GdVO4 in π-polarization were determined to be 2.6 and 10.3×10-19 cm2, respectively, and were smaller than those of Nd:YVO4. On the other hand, the fluorescence lifetime of 1 at% Nd:GdVO4 was evaluated to be 83.4 μs, and was similar to 84.1 μs of 1 at% Nd:YVO4. Therefore, the product of stimulated emission cross section and fluorescence lifetime (σemτf product) of Nd:GdVO4 was smaller than that of Nd:YVO4 under 1 at% of Nd3+ doping concentration. The radiative lifetime of spontaneous emission of Nd:GdVO4 was 168 μs and was 1.9 times longer than that of Nd:YVO4. Because of the low value of radiative quantum efficiency of Nd:GdVO4 (50%), careful cavity design is required for creating a well performing solid-state laser with Nd:GdVO4, based on the larger σemτf product rather than the σemτf product of Nd:YAG.

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Selected Topics in Quantum Electronics, IEEE Journal of  (Volume:11 ,  Issue: 3 )