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在光纤耦合理论及圆锥透镜产生无衍射光束理论的基础上提出了无衍射光束在光纤耦合中的方法。相对于其他方法,无衍射光束更容易耦合进入光纤,特别是单模光纤,并且在其最大准直距离内耦合效率几乎不变,可以减小装调难度。对此方法进行理论分析,并进行实验,加工了光纤耦合使用的圆锥透镜,其锥角为10°,通光半径为5mm。波长为0.6328μm的激光经过准直扩束后入射到圆锥透镜上,产生光斑半径为6.7μm的无衍射光束,在轴向58mm的范围内均可耦合进入光纤,并且耦合效率几乎不变,减小了光纤耦合时的光轴方向对准误差,降低了装调难度,验证了理论分析。
Based on the theory of fiber coupling and the theory of non-diffracting beam generated by conical lens, a method of non-diffracting beam in fiber coupling is proposed. Compared with other methods, the non-diffracted light beam is more easily coupled into the optical fiber, especially the single-mode optical fiber, and the coupling efficiency is almost unchanged within the maximum collimation distance, so that the difficulty of the assembly adjustment can be reduced. The method is theoretically analyzed, and experiments are carried out to fabricate a conical lens used for optical fiber coupling. The cone angle is 10 ° and the light passing radius is 5mm. The laser beam with a wavelength of 0.6328μm is collimated and expanded and then incident on a conical lens, resulting in a non-diffracted beam with a spot radius of 6.7μm, which can be coupled into the optical fiber in the axial direction within a range of 58mm, and the coupling efficiency is almost unchanged. When the optical fiber is coupled, the alignment error of the optical axis is small, which reduces the difficulty of assembly adjustment and verifies the theoretical analysis.