1565nm激光泵浦Tm∶Ho共掺石英光纤激光器稳态特性

The Steady-state Behavior of 1565nm Laser Pumped Tm^(3+)∶Ho(3+) Co-doped Silica Fiber Laser

与800nm和1180nm泵浦带相比较,1565nm泵浦有效消弱了多能级快速非辐射跃迁以及能量上转换损耗。建立了1565nm激光泵浦Tm3+∶Ho3+共掺石英光纤产生2μm激光的理论模型,给出系统完整的速率方程和功率传输方程,采用数值模拟的方法对理想条件下系统稳态特性进行分析。结果表明,采用1565nm激光作为泵浦源,能够获得高效率的激光输出。在泵浦功率为3W、光纤长度2.2m时,输出功率高达1.7W、量子效率57%、斜效率67%。这是目前此类光纤获得的较好转换效率。

As a pump source, 1565nm pumping band can efficiently diminish the loss of manifold fast non-radiative decay and upconversion losses compared to 800nm and 1180nm bands. Theoretical model of Tm^3 ＋ ：Ho^3 ＋ co-doped silica fiber for 2μm laser pumped at 1565nm laser is established. After the comprehensive rate equations and propagation equations are given, characteristics of the system in steady state at hypothesis situation are analyzed by using numerical simulation way. As high as 1.7W laser output power was achieved with a slope efficiency of 67% and quantum efficiency of 57% when the pump power is 3W and fiber length is 2.2m. Numerical simulation results indicate better capability of the fiber and higher conversion efficiency as far as we know.