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增益光纤的折射率和离子掺杂分布是决定光纤激光器输出功率和光束质量的重要因素,针对大模场光纤弯曲效应对模场面积和模场畸变的影响进行了数值分析,采用有限元方法计算了不同折射率和掺杂离子分布光纤的模场面积和增益系数。提出了高斯复合型折射率和掺杂离子分布的大模场增益光纤结构,该结构可有效提高增益光纤的增益系数和高阶模抑制系数,并具有较强的抗弯曲特性,较好的平衡了模场面积与抗弯曲特性的矛盾。根据计算结果设计了直径为65μm的高斯复合型折射率和掺杂分布的增益光纤,在波长为1.064μm的条件下,基模有效模面积达到1.17×103μm2,基模相对增益系数和高阶模相对抑制系数分别达到0.58和0.2088,有效地提高了光纤激光器和放大器的输出光束质量。
The refractive index and ion doping of gain fiber are the important factors that determine the output power and the beam quality of the fiber laser. The influence of the bending effect of the mode field fiber on the mode field and the mode field distortion is numerically analyzed. The finite element method The mode field and gain coefficient of different refractive index and doped ion distribution optical fibers. A large-mode-field gain fiber structure with Gaussian composite refractive index and doping ion distribution is proposed. This structure can effectively increase the gain coefficient and high-order mode suppression coefficient of the gain fiber, and has strong anti-bending property and better balanced mode Conflict between field and bending resistance. According to the calculation results, a Gaussian composite refractive index and doped optical fiber with a diameter of 65μm was designed. The effective mode area of the fundamental mode reached 1.17 × 103μm2 under the wavelength of 1.064μm. The relative fundamental gain coefficient and the relative inhibition of the higher order mode The coefficients reach 0.58 and 0.2088, respectively, effectively improving the output beam quality of fiber lasers and amplifiers.