双包层光纤激光器泵浦光耦合及激光反馈研究

总结分析了高功率双包层光纤激光器的泵浦耦合及激光反馈方式,指出了相关方式中应采取的一些措施.结果表明,采用树枝状结构多模耦合器进行侧向泵浦及采用光纤光栅进行激光反馈是最佳方式.同时特别指出菲涅耳波带片耦合方式的潜在优势,并提出采用镀二色膜等厚球透镜作为双包层光纤激光器腔镜以避免直接端面泵浦对腔镜膜的损坏.

Studies on the pump coupling and laser feedback in double cladding fiber lasers

In this paper, the pump coupling and laser feedback in high power double cladding fiber lasers are analyzed, and some ways that should be taken to enhance the capability are also pointed. Conclusions can be drawn that the best scheme is to use side-pump with tapered fiber bundle and fiber grating as the reflector of laser.The potential of Fresnel zone plate used as the coupling device is given. In order to avoid the destruction of plane dichromatic mirror used as the laser reflector,dichromatic spherical lens with the same thickness used as the feedback of laser is proposed in optical fiber laser design for the first time.