高功率光纤激光信号耦合器（英文）

High power signal combiner for fiber lasers

实验研究了由三根信号光纤锥形束和一根多模光纤组成的3×1信号耦合器.通过仿真,发现锥形长度越长传输效率和输出光束质量越好,同时也验证了对于低阶模场的吸收要高于高阶模场.实验中,制作了锥区长度为10 mm的3×1信号耦合器,在单纤注入信号功率分别为258 W和365 W的情况下获得转换效率为96.6%的信号输出,总输出功率602W,光束质量为M2x=10.5,M2y=9.7.

The 3 × 1 fused tapered fiber bundle（ FTFB） signal combiner consisting of three signal fibers and a multi-mode output fiber was studied. The simulation results indicate that the transfer efficiency and output beam quality are getting better with longer taper length. M oreover,transfer efficiency for low-order mode launching is higher than that for high-order mode launching. A 3 × 1 signal combiner with taper length of 10 mm was fabricated in experiment. The input beam with high beam quality results in high transfer efficiency,which agrees with the simulation results. The transfer efficiency of 96. 6%,total output power of 602 W and output beam quality of M^2x= 10. 5,M2y= 9. 7 were achieved as two fiber lasers with 258 W and 365 W were combined by the FTFB signal combiner.