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| 多次掺杂平坦折射率掺镱光纤的优化制备及性能测试 |
| Optimized fabrication and performance characterization of multi-doped ytterbium-doped fibers with flat refractive index profiles |
| 投稿时间：2025-02-26 |
| DOI：10.3969/j.issn.1005-5630.202502260036 |
| 中文关键词: 多组分掺杂 大模场光纤 光纤激光器 高功率激光 |
| 英文关键词:multi-component doping large-mode-field fiber fiber laser high-power laser |
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| 摘要点击次数: 10 |
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| 中文摘要: |
| 掺镱光纤是高功率光纤激光器的核心器件，在工业、医疗、国防等领域有着广泛应用。本文利用改良的化学气相沉积方法结合溶液掺杂技术制备掺镱光纤，通过多组分掺杂探究了磷、铝元素对折射率的调节作用。利用该掺杂方法分别制备了3次、5次、7次掺杂的光纤预制棒，并根据等效仿真对比了各光纤性能。并基于3次掺杂的方式对预制棒折射率进行优化，结合掺氟技术制备出具有包层折射率沟道的平坦折射率掺镱光纤预制棒，成功拉制出纤芯、包层直径分别为20 μm和400 μm的光纤。元素分析结果显示，光纤中各元素分布均匀，且纤芯实现了摩尔分数为0.3%的高浓度镱掺杂。最后，搭载3 kW光纤激光器对该光纤进行性能测试，其可实现拟合斜率效率为81.8%的激光输出。研究表明，改良的化学气相沉积技术结合溶液掺杂的方法可以实现多次掺杂平坦折射率的高浓度掺镱光纤制备。 |
| 英文摘要: |
| Ytterbium-doped fiber constitutes the core component of high-power fiber laser, which are widely used in industrial, medical, defense and other fields. In this paper, the fabrication of ytterbium-doped optical fiber is investigated using a modified chemical vapor deposition system combined with solution doping technology based on a multi-component doping solution. The effects of phosphorus and aluminum elements on the refractive index are studied, including their role in refractive index adjustment. Using this doping method, 3-, 5-, and 7-co-doped optical fiber preforms were fabricated. Based on equivalent simulation and performance comparison, the results were in good agreement. Subsequently, the refractive index profile of the preform was optimized via tri-doping, and fluorine doping was adopted to fabricate a flat-profile ytterbium-doped optical fiber preform with a cladding refractive index trench. This preform was successfully drawn into an optical fiber with core and cladding diameters of 20 μm and 400 μm, respectively. Elemental analysis confirmed that the elemental distribution in the fiber was uniform, and the core presented a high-concentration ytterbium doping with a molar fraction of 0.3%. Finally, the fiber performance was evaluated using a 3 kW fiber laser system, yielding a laser output with a slope efficiency of 81.8%. The results demonstrate that the combination of modified chemical vapor deposition and solution doping is an effective method for fabricating high-concentration ytterbium-doped fibers with multi-element co-doping and flat refractive index profiles. |
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