Nd：GGG晶体生长、光谱性能及激光性能(英文)

GROWTH,SPECTRAL PROPERTIES AND LASER PERFORMANCE OF Nd:GGG CRYSTAL

采用提拉法生长掺钕钆镓石榴石(neodymium-doped gadolinium gallium garnet,Nd:GGG)激光晶体,选择最佳工艺参数:提拉速率为2～4mm/h;转速为20～40r/min;冷却速率为20℃/h。测试了晶体的吸收和荧光光谱,结果表明:主吸收峰位于808nm,主发射峰位于9430cm–1,对应于Nd3+的4F3/2–4I11/2跃迁。对晶体样品进行了激光性能测试。结果表明:当泵浦功率为900mW时,对泵浦光的吸收效率为85%,激光输出波长约为1μm,激光输出功率为305mW,激光阈值功率为380mW,光–光转换效率达57.8%,斜效率达57.6%。

The optimum processing parameters for growth of neodymium-doped gadolinium gallium garnet （Nd：GGG） laser crystal was studied by the Czochralski method. The absorption and fluorescence spectra as well as the laser performance of Nd：GGG were measured. The research results indicate that： （1） The optimal pulling rate is 2-4 mm/h, the optimal rotation rate is 20-40 r/min and the best cooling rate is 20 ℃/h. （2） The main absorption peak of Nd：GGG is at 808 nm and the fluorescence emission peak is at 9 430 cm^-1, corresponding to the 4F3/2-4I11/2 emission band of the Nd^3＋. （3） The absorption efficiency of the pumping laser is 85%. When the pumping power is 900 mW, the wavelength of the output laser is about 1 um, while the output power is 305 mW. The laser threshold is 380 mW. The optical to optical efficiency is 57.8%, and the slope efficiency is 57.6%.