Coupling of highly elliptical laser diode emission into single mode fiber using two spherical ball lenses is investigated and the effectiveness of the mode matching with the circular mode field of the fiber is realized. Coupling efficiency is theoretically analyzed by employing ray and Gaussian beam optics. A 100% coupling efficiency is obtained is found to be largely affected by the angular, lateral and transversal offsets. It can also be controlled significantly by optimizing the lenses separation distance. The experimental measurements agree with the theoretical calculations. However, the maximum coupling efficiency obtained is around 75% due to some practical limitations regarding the positioning of ball lenses and their separation. From the variation of coupling efficiency with lateral, transversal and angular offsets, the effective mode matching is inferred. Laser welding technique with active alignment facilities have been used in the alignment and attachment of all the coupling components. Laser welding pulse parameters have been optimized for reliable weld yield.ududKeywords: Coupling efficiency, laser welding, misalignment tolerances, mode field, ball lenses
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机译:研究了使用两个球形球透镜将高椭圆激光二极管发射耦合到单模光纤中,并实现了与光纤的圆模场匹配的效率。理论上通过使用射线和高斯光束光学器件来分析耦合效率。发现获得的100%耦合效率在很大程度上受到角度,横向和横向偏移的影响。还可以通过优化镜片的分离距离来对其进行有效控制。实验测量结果与理论计算吻合。但是,由于球镜的位置及其分离方面的一些实际限制,获得的最大耦合效率约为75%。从耦合效率随横向,横向和角度偏移的变化,可以得出有效的模式匹配。具有主动对准装置的激光焊接技术已用于所有联接部件的对准和连接。激光焊接脉冲参数已经过优化,可确保可靠的焊接产量。 ud ud关键字:耦合效率,激光焊接,未对准公差,模场,球镜
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