V型槽侧面抽运的光学耦合模型的研究

Analysis and Computation of A Two-Lens Optical Coupling Model for V-groove Side-pumping of Double-Cladding Fiber

V型槽侧面耦合是目前双包层光纤抽运光耦合的方法之一。本文提出了一种二透镜光学系统的耦合模型,并利用几何光学的ABCD矩阵分析和计算了透镜焦距与激光二极管阵列(LD-Arrays),透镜,双包层光纤(DCF)三者之间间距的关系,同时通过计算确定了V型槽所开的最佳角度。通过数值模拟计算发现透镜焦距的选取在很小范围内会引起两透镜间距的剧烈变化而且激光二极管与透镜的间距以及两透镜间的间距主要取决于靠近激光二极管那个透镜的焦距大小。本文的分析和计算对V型槽侧面抽运的光学耦合系统中透镜焦距的选取以及LD,透镜,DCF三者之间间距的设置的最优化提供了理论指导。

A two-lens optical-system coupling-model is presented.By ABCD Law methed,The relationship of the focuses of two lenses and the spaces between lenses,DCF and laser diode is analyzed and caculated. And the best angle of the V-groove is comfirmed.The result of the computation show that the space between the two lenses will change acutely when the focuses of the two lenses change in a small range.And the focus of the first lens has mostly decided the space between the laser diode and the first lens and the space between the two lenses.