物理学报2024，Vol.73Issue(14)：106-111,6.DOI:10.7498/aps.73.20240463
一种基于反谐振结构的三能级掺钕激光光纤设计
Design of three-level Nd-doped laser fiber based on anti-resonant structure
摘要
Abstract
900-nm Nd-doped fiber laser can find widespread applications including biomedical diagnosis,laser detection,and spectral analysis.The four-level gain competition of Nd3+around 1060 nm severely constrains the laser power scaling of the 900-nm three-level Nd-doped fiber laser.In this work,we propose a large-mode-area Nd-doped double-layer solid-core anti-resonant fiber with a core diameter of 27 μm for generating a high-power 900-nm laser based on the resonant and anti-resonant conditions of anti-resonant fiber.The transmission properties and mode profiles of the designed fiber are analyzed theoretically by using the full-vector finite-element method combined with an optimized mesh size.By introducing the double-layer anti-resonant elements into the active fiber and optimizing the fiber structure parameters and refractive index distribution,the high-order modes are well coupled with cladding modes.Finally,the designed fiber exhibits a confinement loss below 0.1 dB/m for fundamental mode and the confinement losses of all high-order modes are greater than 10 dB/m in 880-913 nm band.More importantly,around 1060 nm,the confinement losses of all modes can reach up to 100 dB/m,which enables the designed Nd-doped fiber to effectively suppress parasitic lasing and even amplified spontaneous emission.The Nd-doped solid-core anti-resonant fiber proposed in this study shows broad application prospects in the fields of 900-nm high-power fiber laser and amplifier.The developed chemical vapor deposition process combined with stack-and-draw technology can be adopted for the fabrication of the designed fiber.In order to ensure the optical performance of the anti-resonant fiber,it is necessary to accurately control the thickness of all anti-resonant tubes,the glass composition of the active core and background area in actual fabrication.关键词
实芯反谐振光纤/掺钕光纤/大模场面积光纤/单模光纤Key words
solid-core anti-resonant fiber/Nd-doped fiber/large-mode-area fiber/single-mode fiber引用本文复制引用
许海琛,付士杰,田浩,盛泉,史伟,姚建铨..一种基于反谐振结构的三能级掺钕激光光纤设计[J].物理学报,2024,73(14):106-111,6.基金项目
国家自然科学基金(批准号:62375201,62105240,62075159,61975146,62275190)、天津大学自主创新基金(批准号:2023XPD0020)和山东省重点研发计划(批准号:2020CXGC010104,2021CXGC010202)资助的课题. Project supported by the National Natural Science Foundation of China(Grant Nos.62375201,62105240,62075159,61975146,62275190),the Seed Foundation of Tianjin University,China(Grant No.2023XPD-0020),and the Key R&D Program of Shandong Province,China(Grant Nos.2020CXGC010104,2021CXGC010202). （批准号:62375201,62105240,62075159,61975146,62275190）
