用于高功率光纤激光器的全光纤7×1信号合束器。

All-fiber 7 × 1 signal combiner for high power fiber lasers.

作者信息

Zhou Hang, Chen Zilun, Zhou Xuanfeng, Hou Jing, Chen Jinbao

出版信息

Appl Opt. 2015 Apr 10;54(11):3090-4. doi: 10.1364/AO.54.003090.

DOI:10.1364/AO.54.003090

Abstract

We present an all-fiber 7×1 signal combiner for high power fiber lasers. Through theoretical analysis, the fabrication method is confirmed and the taper length of the fiber bundle is chosen to be 1 cm to ensure a high transmission efficiency of the combiner. Based on the theoretical results, an all-fiber 7×1 signal combiner with high transmission efficiency is fabricated. A capillary with low refractive index is fused around the bundle of signal fibers to make an additional cladding layer. Then the fiber bundle is tapered to match the core of the output fiber and then spliced with the output fiber. The combiner is tested with a 500 W fiber laser and a temperature increase of 13°C/kW without any active cooling is observed in the combiner. The power transmission efficiency is measured to be close to 99% for each input port and the beam quality M2 is around 10.

摘要

我们展示了一种用于高功率光纤激光器的全光纤7×1信号合束器。通过理论分析，确定了制造方法，并选择光纤束的锥度长度为1厘米，以确保合束器具有高传输效率。基于理论结果，制造出了具有高传输效率的全光纤7×1信号合束器。在信号光纤束周围熔接一根低折射率的毛细管，以形成额外的包层。然后将光纤束拉锥以匹配输出光纤的纤芯，再与输出光纤进行熔接。用一台500瓦的光纤激光器对该合束器进行测试，观察到合束器在没有任何主动冷却的情况下，温度升高为13°C/kW。测量得到每个输入端口的功率传输效率接近99%，光束质量M2约为10。