Zhang Peixiong, Xu Min, Zhang Lianhan, Hong Jiaqi, Wang Xianyong, Wang Yaqi, Chen Guangzhu, Hang Yin
Opt Express. 2015 Oct 19;23(21):27786-94. doi: 10.1364/OE.23.027786.
A novel Dy(3+)/Yb(3+) co-doped PbF2 mid-IR laser crystal was successfully grown using the vertical Bridgman method. Efficient emission at around 3 μm from the crystal was observed under excitation of a conventional 970 nm laser diode (LD). The energy transfer efficiency from Yb(3+) to Dy(3+) in Dy(3+)/Yb(3+):PbF2 crystal is as high as (97.7±0.3)%. It is also found that the Dy(3+)/Yb(3+):PbF2 crystal possesses long fluorescence lifetime (15.4±0.2) ms, high quantum efficiency (95.0±0.3)%, and large emission cross section (1.37±0.11)×10(-20) cm2 corresponding to the stimulated emission of Dy(3+):(6)H(13/2)→(6)H(15/2) transition. Additionally, the phonon energy of the crystal was analyzed by the Raman spectrum. These results indicate that Dy(3+)/Yb(3+):PbF2 crystal may become a promising material for 3 μm solid state lasers under a conventional 970 nm LD pump.
采用垂直布里奇曼法成功生长出一种新型Dy(3+)/Yb(3+)共掺杂的PbF2中红外激光晶体。在传统970 nm激光二极管（LD）激发下，观察到该晶体在3 μm左右有高效发射。Dy(3+)/Yb(3+):PbF2晶体中从Yb(3+)到Dy(3+)的能量转移效率高达(97.7±0.3)%。还发现Dy(3+)/Yb(3+):PbF2晶体具有长荧光寿命(15.4±0.2) ms、高量子效率(95.0±0.3)%以及对应Dy(3+):(6)H(13/2)→(6)H(15/2)跃迁受激发射的大发射截面(1.37±0.11)×10(-20) cm2。此外，通过拉曼光谱分析了该晶体的声子能量。这些结果表明，在传统970 nm LD泵浦下，Dy(3+)/Yb(3+):PbF2晶体可能成为一种有前景的3 μm固态激光材料。
