保偏光纤激光器的实验研究

Experimental Study on Polarization-Maintaining Fiber Laser

从耦合波方程出发,对掺钕光纤激光器输出功率沿光纤的分布进行了数值模拟,并对掺钕光纤激光器所需要光纤的最佳长度进行了分析.以808 nm半导体激光器为抽运源,掺钕双包层保偏光纤为增益介质,使用对808 nm高透,1060 nm高反的二色镜和垂直切割的光纤端面(4%的菲涅耳反射)构成法布里-珀罗(F-P)光学谐振腔,对保偏光纤激光器进行了实验研究.实验中测量了掺钕光纤的荧光光谱,并就不同抽运电流对激光器输出功率和偏振特性进行了研究,在波长1060 nm处得到了7.5 W的激光输出,斜率效率为56%.

By means of numerical analysis, based on the coupling wave function, the distribution of pump and output laser power along the fiber has been researched, and the optimal fiber length is calculated. The experimental research of the Nd^3＋-doped polarization-maintaining fiber laser is reported, which is pumped by 808 nm semiconductor laser. The dichroic mirror of high transission （HT） at 808 nm and high reflection （HR） at 1060 nm is employed to construct the Fabry-Perot （F-P） cavity with the vertically-cut fiber cross section （Fresnel reflectivily of 4%）. The influences of pump current on output power and polarization characteristic of the laser are studied. The fluorescence spectrum of Nd^3＋-doped fiber is measured. The maximum output power of the laser is 7.5 W at 1060 nm, and the slope efficiency is 56%.