Er^(3+):Yb^(3+):GdAl_3(BO_3)_4晶体1.5～1.6μm波段激光性能

Laser Performance of Er^(3+):Yb^(3+):GdAl_3(BO_3)_4 Crystal at 1.5～1.6 μm

采用熔盐法获得了Yb3+和Er3+离子原子数分数分别为20%和1.1%的GdAl3(BO3)4(简称GAB)晶体.在平-凹谐振腔中,利用0.97μm波长光纤耦合准连续(CW)半导体激光端面抽运0.7 mm厚的该晶体,当输出镜透过率为1.5%时,获得斜率效率为20%,最高功率为1.75 W的1.5~1.6μm波段激光输出.输出激光波长随吸收抽运功率和输出镜透过率发生变化.当输出镜透过率为1.5%时,随着吸收抽运功率的增加,不仅起振的纵模带增加并且输出功率逐渐从1.60μm的纵模带中转移到1.55μm的纵模带中.而当吸收抽运功率为13.6 W时,随着输出镜透过率的增加,输出激光波长从1.60μm转移到1.52μm.结果表明Er3+和Yb3+双掺的GAB晶体是一种优秀的1.5~1.6μm波段激光材料.

An Er^3＋ ：Yb^3＋ ：GdAl3 （BO3）4 （GAB） crystal with Yb^3＋ and Er^3＋ atoms fraction of 20% and 1.1% was grown by the flux method. End-pumped by a fiber-coupling quasi-continuous wave （CW） diode laser at 0.97 μm, 1.5-1.6 μm laser with output power up to 1.75 W and slope efficiency near to 20% was realized from a 0.7 mm thick Er^3＋： Yb^3＋ ： GAB crystal in a hemispherical cavity with the output coupler transmission of 1.5%. The influences of the absorbed pump powers and output coupler transmissions on the laser spectra were also investigated. When the output coupler transmission was 1.5% and the absorbed pump power was increased, more longitudinal mode groups were observed and the main output laser power gradually shifts from the longitudinal mode group around 1.60 μm to around 1.55 μm. When the absorbed pump power was 13.6 W and output coupler transmission was increased, laser wavelength was shifted from 1.60 μm to 1.52 μm. The results show that the Er^3＋ and Yb^3＋ co-doped GAB crystal is an excellent gain medium for realizing 1.5- 1.6 μm laser.