大芯径功率光纤中传输的激光束质量与偏振度研究

研究了在大芯径、多模功率光纤中传输的激光束光束质量和偏振与光纤长度的关系。用芯径为0．6mm的国产石英光纤及芯径为0．4mm和0．6mm的3M光纤做样品，实验结果表明输出光束的光束质量因子M^2值是光纤长度的双曲正切复合函数。线偏振光经光纤后其偏振度随光纤长度的变化呈指数衰减的关系。

Study of the Laser Beam Quality and Polarization Degree in Large-Core Optical Power Fiber

In this paper, the beam quality and polarization degree of laser beam which propagated in large core multimode power fibers is studied. Domestic fused silica optical fiber with core diameter of 0.6 mm and 3M silica fibers with core diameters of 0.4 mm and 0.6 mm were used for experiment. It is found that, the output beam quality factor M 2 is a compound tanh function of fiber lengths of every kind fiber. Linearly polarized laser beam launched into a multimode fiber suffer depolarization, the output beam′s polarization degree is an exponent function of fiber length and this relationship is agreed well with every kind of fiber.