不同退火气氛下Yb:Lu_3Al_5O_(12)晶体的光谱和激光性能研究

Spectroscopic and Laser Properties of Yb:Lu_3Al_5O_(12) Crystal under Different Annealing Atmospheres

采用提拉法生长Yb^(3+)掺杂原子数分数为10%高质量的Yb:Lu_3Al_5O_(12)(Yb:LuAG)晶体。对晶体在不同气氛下退火的光谱性能进行了表征。研究发现,吸收光谱中363和562 nm附近的吸收带与Yb^(2+)有关。晶体在空气气氛下退火后,测得的荧光光谱强度最强,荧光寿命最长。增益截面曲线的研究表明Yb:LuAG晶体具有宽的发射带。在抽运功率为9.59 W的激光二极管(LD)抽运下,Yb:LuAG晶体获得3.05 W的连续激光输出,斜率效率为41.7%,激光抽运阈值为40 mW。

High quality Yb：Lu3Al5O（12（Yb：LuAG crystal doped with 10%atom fraction Yb3＋ was grown by the Czochralski method.After annealing under different atmospheres,the spectral properties of the crystal were characterized.The experiment indicates that the absorption band in 363 nm and 562 nm are connected with Yb2＋. After air annealing,the intensity of fluorescence spectra is the strongest and the fluorescent lifetime is the longest. The curve of gain cross-section indicates that Yb：LuAG crystal has a wide emission band.Under laser diode（LD pumping with 9.59 W power,the maximum output power,the slope efficiency,and the lasing threshold of Yb：LuAG crystal are 3.05 W,41.7%,and 40 mW,respectively.