Design of 2 μm Low-Loss Hollow-Core Anti-Resonant Fibers

Sun, Tianran; Su, Xinyang; Meng, Fanchao; Wang, Z.G.; Song, Junxian; Zhang, Chenglong; Xu, Tianjia; Zhang, Yunhong; Zhang, Huaiwei; Cui, Meng; Zheng, Yi

doi:10.3390/mi14061198

Cited by 5 publications

(1 citation statement)

References 26 publications

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“…纤芯与背景区域折射率差值能够在当前激光玻璃制备技术下得以实现 [20][21] 纤芯和背景区域不可避免的折射率差导致纤芯模式泄漏 [14] ，从而引起基模传输损耗的增大。这一现象随着纤芯尺寸增加更加严重，从而限制了光纤的模场面积。进一步的光纤模场面积提升仍需设计新型反谐振结构 [22][23][24] ，加强对纤芯区域 900 nm 基模光的限制能力、降低大模场光纤下 900 nm 基模光的限制损耗。…”

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Design of three-level Nd-doped laser fiber based on anti-resonant structure

Xu,

Fu,

Tian

et al. 2024

Acta Phys. Sin.

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900 nm Nd-doped fiber laser can find widespread applications including biomedical diagnosis, laser detection, and spectral analysis. However, the four-level (4F3/2→4I11/2) gain competition of Nd3+ around 1060 nm severely constrains the laser power scaling of the 900 nm three-level (4F3/2→4I9/2) Nd-doped fiber laser. Recently, anti-resonant fiber based on anti-resonant guiding mechanism has attracted intense attention due to its properties of wide transmission band, low transmission loss, and high mode purity under large core size. In this work, we propose a large-mode-area Nd-doped double-layer solid-core anti-resonant fiber with core diameter of 27 μm for high-power 900 nm laser generation 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 with the full-vector finite-element method combined with 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 those of all high-order modes are greater than 10 dB/m in 880-913 nm band. More importantly, the confinement losses of all modes are up to 100 dB/m around 1060 nm, which allows the designed Nd-doped fiber for efficient parasitic lasing and even amplified spontaneous emission suppression. The Nd-doped solid-core anti-resonant fiber proposed in this paper 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. To guarantee the optical performance of the anti-resonant fiber, it is necessary to accurately control the thicknesses of all anti-resonant tubes, the glass composition of the active core and background regions in practical fabrication. The power handing capability of the designed fiber is mainly constrained by the structure defects and material impurity introduced during the fabrication process, and the nonlinear effects under high laser power is another factor that should to be considered to improve the power handing capability of the proposed fiber.

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