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Volume 11
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10.3390/photonics11060565
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Article

Ytterbium-Doped Double-Clad Fiber with High Uniformity of Concentration Distribution and Suppressed Photodarkening

by
Yongqing Yi
,
Yize Shen
,
Pengcheng Geng
,
Rong Pan
,
Shijie Xu
* and
Ruifang Luo
Tianjin Key Laboratory of Special Optical Fiber Materials, The 46th Research Institute, China Electronics Technology Group Corporation, Tianjin 300220, China
*
Author to whom correspondence should be addressed.
Photonics 2024, 11(6), 565; https://doi.org/10.3390/photonics11060565
Submission received: 21 April 2024 / Revised: 7 June 2024 / Accepted: 7 June 2024 / Published: 17 June 2024
(This article belongs to the Special Issue The Emerging Science and Applications of Fiber Laser Technology)
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Abstract

Photodarkening (PD) effect in ytterbium-doped fiber (YDF) has a significant impact on the high-power operational stability of fiber lasers, which seriously hinders the power scaling. In this paper, the relationship between ytterbium ions uniformity and the photodarkening effect in the YDF was investigated, and the fabrication process allowing improving the ytterbium ions uniformity in the core of preforms for suppressing the photodarkening effect was developed. The Modified Chemical Vapor Deposition (MCVD) method combined with Chelate Vapor Deposition (CVD) technology was adopted for multi-layer fiber core deposition, and an all-gas-phase technical process was proposed to improve the ytterbium ions uniformity in the Al/P co-doped glass matrix. The 25/400 μm YDFs obtained by this technology achieved stable 3.5 kW laser output power for 8 h with suppressed PD and nonlinear effects.
Keywords: ytterbium-doped double-clad fiber; ytterbium ion uniformity; photodarkening effect; multilayer gradient deposition ytterbium-doped double-clad fiber; ytterbium ion uniformity; photodarkening effect; multilayer gradient deposition

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MDPI and ACS Style

Yi, Y.; Shen, Y.; Geng, P.; Pan, R.; Xu, S.; Luo, R. Ytterbium-Doped Double-Clad Fiber with High Uniformity of Concentration Distribution and Suppressed Photodarkening. Photonics 2024, 11, 565. https://doi.org/10.3390/photonics11060565

AMA Style

Yi Y, Shen Y, Geng P, Pan R, Xu S, Luo R. Ytterbium-Doped Double-Clad Fiber with High Uniformity of Concentration Distribution and Suppressed Photodarkening. Photonics. 2024; 11(6):565. https://doi.org/10.3390/photonics11060565

Chicago/Turabian Style

Yi, Yongqing, Yize Shen, Pengcheng Geng, Rong Pan, Shijie Xu, and Ruifang Luo. 2024. "Ytterbium-Doped Double-Clad Fiber with High Uniformity of Concentration Distribution and Suppressed Photodarkening" Photonics 11, no. 6: 565. https://doi.org/10.3390/photonics11060565

APA Style

Yi, Y., Shen, Y., Geng, P., Pan, R., Xu, S., & Luo, R. (2024). Ytterbium-Doped Double-Clad Fiber with High Uniformity of Concentration Distribution and Suppressed Photodarkening. Photonics, 11(6), 565. https://doi.org/10.3390/photonics11060565

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