基于复合抛物面聚光器的光纤耦合系统研究

Research of fiber coupling system based on compound parabolic concentrator

为了使光纤激光器能高效率地抽运、完成大功率激光的输出,一般通过双透镜组将抽运源耦合进有源掺杂光纤。而为了进一步提高抽运效率、简化耦合系统,可以用复合抛物面聚光器来取代双透镜组。复合抛物面聚光器可以将最大接收角范围内的光全部会聚到其出射面,并且大部分能量都集中在有源掺杂光纤的数值空间范围内,因此具有很高的耦合效率。此外,复合抛物面聚光器还具有结构简单、尺寸较小、与抽运光源的对接简单等优点。仿真研究证实了复合抛物面聚光器比双透镜组的耦合效率更高,非常适用于光纤激光器的抽运光注入实验,为生成大功率激光器提供了条件。

In order to enable the fiber laser to efficiently pump and generate high power laser,the pump source is typically coupled into the active doped fiber through a duplet lens system.For there are some disadvantages of duplet lens system,it can be replaced by a compound parabolic concentrator to improve the pumping efficiency and simplify the coupling system.The compound parabolic concentrator can concentrate all the lights with incident angles less than its maximum acceptance angle to its exit surface,and most of the energy is concentrated within the active doped fiber’s acceptance angle,so it has high coupling efficiency.In addition,the compound parabolic concentrator has the advantages of simple structure,small size,and simple docking with the pump source.Simulation proves that the compound parabolic concentrator has higher coupling efficiency than the duplet lens system,which is very suitable for the pump source injection test of fiber laser and can provide conditions for generating high power laser.