基于共掺杂Dy-Tb∶YAG晶体的全固态黄光激光特性研究

All-Solid-State Yellow-Laser Characteristics Based on Co-Doped Dy-Tb∶YAG Crystal

为提高激光上下能级的粒子反转速度,采用具有高声子能量的YAG晶体作为掺杂基质,通过多声子弛豫的方式加速6H13/2能级的粒子数消耗;同时引入与激光下能级能量相近的Tb^3+离子,实现Dy^3+∶6H13/2与Tb^3+∶7F4之间的共振能量转移,成功地减小了6H13/2的能级寿命,首次获得了582.1 nm的黄光激光输出。通过对比Dy∶YAG与Dy-Tb∶YAG的荧光光谱,分析了Tb^3+离子掺入对激光上能级寿命的影响。

A YAG crystal exhibiting high phonon energy is used as the doping matrix to accelerate the depopulation of the 6H13/2 energy level by multi-phonon relaxation and improve the population inversion velocities of the laser upper and lower energy levels.Simultaneously,an energy transfer between Dy^3+∶6H13/2 and Tb^3+∶7F4 is achieved by introducing Tb^3+ions exhibiting an energy level similar to that exhibited by the laser lower level;thus,the energy lifetime of 6H13/2 is successfully reduced and the yellow laser output of 582.1 nm is obtained for the very first time.Furthermore,the effects of the Tb^3+ions on the lifetime of the laser upper energy levels are analyzed by comparing the Dy:YAG and Dy-Tb:YAG fluorescence spectra.