激光二极管泵浦Tm:CaF单晶光纤的高效~2μm连续波激光运转

High-efficiency ∼2 µm CW laser operation of LD-pumped Tm:CaF single-crystal fibers.

作者信息

Wang Yangxiao, Wang Shaozhao, Wang Jingya, Zhang Zhonghan, Zhang Zhen, Liu Rongrong, Zu Yuqian, Liu Jie, Su Liangbi

出版信息

Opt Express. 2020 Mar 2;28(5):6684-6695. doi: 10.1364/OE.386659.

Abstract

The Tm:CaF single-crystal fibers were successfully grown by modified temperature gradient technique method. The J-O intensity parameters, spontaneous radiative transition rates, radiative lifetimes and fluorescence branching ratios of Tm were calculated with Judd-Ofelt theory. A systematic study of the fluorescence characteristics has been carried out. Simulated emission cross-sections of the F → H transition were calculated to be 6.68×10 cm and 4.65×10cm for crystal doped with 3 at.% and 4 at.% Tm. The 64.4% slope efficiency with output power of 2.23W was achieved in 3 at.% Tm:CaF single-crystal fiber. The slope efficiency decreased to 44.5% and maximum output power decreased to 1.65W in 4 at.% Tm:CaF single-crystal fiber. Obtained results show that Tm-doped CaF single-crystal fibers are promising materials for IR laser action generation.

摘要

采用改进的温度梯度技术方法成功生长出了Tm:CaF单晶光纤。利用Judd-Ofelt理论计算了Tm的J-O强度参数、自发辐射跃迁速率、辐射寿命和荧光分支比。对荧光特性进行了系统研究。对于掺杂3at.%和4at.%Tm的晶体，计算出F→H跃迁的模拟发射截面分别为6.68×10 cm和4.65×10cm。在3at.%Tm:CaF单晶光纤中实现了64.4%的斜率效率，输出功率为2.23W。在4at.%Tm:CaF单晶光纤中，斜率效率降至44.5%，最大输出功率降至1.65W。所得结果表明，掺杂Tm的CaF单晶光纤是产生红外激光作用的有前景的材料。