Nd∶ASL单晶光纤的生长、光谱和激光性能研究

Growth,Spectroscopic Properties and Laser Performance of Nd∶ASL Single Crystal Fibers

采用微下拉法制备了不同浓度Nd^(3+)掺杂的Sr 0.7 La 0.3 Mg 0.3 Al 11.7 O 19(Nd∶ASL)单晶光纤,并对其晶体结构、偏振光谱和连续激光性能进行了研究。计算得到Nd∶ASL单晶光纤的光谱参数Ω2、Ω4和Ω6分别为1.09310^(-20)、2.28510^(-20)和2.11710^(-20)cm^(2)。0.5%、1.0%、3.0%和5.0%Nd∶ASL单晶光纤^(4)F_(3/2)能级的荧光寿命分别为375、398、384和363μs。采用发射波长800 nm的激光二极管泵浦3.0%Nd∶ASL(原子数分数)单晶光纤,在1055 nm处获得了1.08 W的连续激光输出,斜效率为18.5%。研究结果表明采用微下拉生长的Nd∶ASL单晶光纤是一种有潜力的激光增益介质。

Nd^(3+)-doped Sr 0.7 La 0.3 Mg 0.3 Al 11.7 O 19(Nd∶ASL)single crystal fibers with different Nd^(3+)concentration were successfully grown by the micro-pulling-down(μ-PD)method.The crystal structure,polarized spectroscopic properties and continuous wave laser performance were studied.The Judd-Ofelt parametersΩ2,Ω4 andΩ6 are obtained to be 1.09310^(-20),2.28510^(-20)and 2.11710^(-20)cm 2,respectively.The fluorescence lifetime of 0.5%,1.0%,3.0%and 5.0%Nd∶ASL single crystal fibers are 375,398,384 and 363μs,respectively.A continuous wave laser is obtained by pumping with a commercial laser diode of 800 nm emission wavelength.The maximum output power is 1.08 W at 1055 nm with a slope efficiency of 18.5%.All the results indicate that Nd^(3+)-doped ASL single crystal fiber grown by theμ-PD method has potential as a laser gain medium for laser system.