Specialty Optical Fibers and Their High-Power Applications

A special issue of Photonics (ISSN 2304-6732). This special issue belongs to the section "Lasers, Light Sources and Sensors".

Deadline for manuscript submissions: 15 June 2024 | Viewed by 2636

Special Issue Editors

College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China
Interests: fiber laser and amplifier; specialty optical fiber; fiber design; fiber material and fabrication; fiber and laser characterization; fiber optics
College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China
Interests: fiber laser and amplifier; specialty optical fiber; fiber optics

Special Issue Information

Dear Colleagues,

Optical fiber is an important carrier for laser generation and transmission, which is also the heart of fiber lasers. The huge progress in optical fiber design/fabrication and fiber-based optical components has enabled the rapid development of fiber lasers in the past two decades. However, fiber lasers also encounter a series of limiting factors, such as nonlinear effects, photodarkening, and transverse mode instability, that hinder further performance improvement. In this case, specialty optical fibers, which offer additional degrees of design flexibility, have shown enormous potential and have brought dynamism into the development of fiber lasers, especially for high-power fiber laser applications. The specialty optical fiber could be manipulated in both the transversal and longitudinal dimensions, and the material compositions could also be optimized to alleviate the detrimental effects and meet the demands of specific applications. Therefore, specialty optical fibers become an increasingly important driving factor for the fiber laser community.

This Special Issue aims to highlight the recent advances in the field of specialty optical fibers and their high-power applications. Original papers and review articles are welcome. Technical topics include but are not limited to the following research areas:

  • Modeling and design method of specialty optical fiber;
  • Specialty optical fiber fabrication technology;
  • Specialty optical fiber materials for lasers, aiming at photodarkening suppression, TMI mitigation, nonlinear effects suppression, radiation resistance, etc.;
  • Techniques for characterizing specialty optical fibers;
  • Functional optical fibers for long-range power delivery, single-mode operation, bending distortion resistance, laser polarizing, etc.;
  • Large-mode-area fibers for high-order-mode suppression and TMI mitigation, including but not limited to 3C fiber, spectral filtering fiber, multi/single-trench fiber, large-pitch fiber, confined-doped fiber, low numerical aperture fiber, tapered fiber, etc.;
  • Specialty optical fiber based-components;
  • Specialty optical fiber-based lasers and amplifiers, including but not limited to the rare-earth-doped fiber laser, Raman fiber laser, gas-filled Raman fiber laser, Brillouin fiber laser, random fiber laser, optical parametric oscillator, optical parametric amplifier, etc.

We look forward to receiving your contributions.

Dr. Liangjin Huang
Dr. Hanshuo Wu
Guest Editors

Manuscript Submission Information

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Keywords

  • specialty optical fibers design
  • specialty optical fibers fabrication
  • photonic crystal, microstructured, and hollow core fibers
  • large mode area fiber
  • fiber lasers and amplifiers

Published Papers (2 papers)

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Research

11 pages, 3490 KiB  
Article
A 5 kW Nearly-Single-Mode Monolithic Fiber Laser Emitting at ~1050 nm Employing Asymmetric Bi-Tapered Ytterbium-Doped Fiber
by Xiangming Meng, Fengchang Li, Baolai Yang, Peng Wang, Zhiping Yan, Yun Ye, Xiaoming Xi, Hanwei Zhang, Zhiyong Pan, Xiaolin Wang and Fengjie Xi
Photonics 2023, 10(10), 1158; https://doi.org/10.3390/photonics10101158 - 16 Oct 2023
Viewed by 1033
Abstract
Limited by stimulated Raman scattering (SRS), amplified spontaneous emission (ASE) and transverse mode instability (TMI), it is challenging to achieve high-power laser output in ytterbium-doped fiber (YDF) lasers with operating wavelengths less than 1060 nm. In high-power fiber lasers, bi-tapered YDF can provide [...] Read more.
Limited by stimulated Raman scattering (SRS), amplified spontaneous emission (ASE) and transverse mode instability (TMI), it is challenging to achieve high-power laser output in ytterbium-doped fiber (YDF) lasers with operating wavelengths less than 1060 nm. In high-power fiber lasers, bi-tapered YDF can provide a balance between the suppression of SRS and TMI. In this work, we designed and fabricated a new double-cladding asymmetric bi-tapered YDF to suppress ASE and SRS in the 1050 nm monolithic fiber laser. The asymmetric bi-tapered YDF has an input end with a core/cladding diameter of ~20/400 μm, a middle section with a core/cladding diameter of ~30/600 μm and an output end with a core/cladding diameter of ~25/500 μm. The working temperature of the non-wavelength-stabilized 976 nm laser diodes was optimized to improve the TMI threshold. An output power of over 5 kW with an efficiency of 83.1% and a beam quality factor M2 of about 1.47 were achieved. To the best of our knowledge, this represents the highest power nearly-single mode in 1050 nm fiber lasers. This work demonstrates the potential of asymmetric bi-tapered YDF for achieving a high-power laser with high beam quality in 1050 nm fiber lasers. Full article
(This article belongs to the Special Issue Specialty Optical Fibers and Their High-Power Applications)
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6 pages, 1396 KiB  
Communication
Transverse Anderson Localization Enhancement for Low-Filling-Rate Glass–Air Disordered Fibers by Optimizing the Diameter of Air Holes
by Jiajia Zhao, Yali Zhao, Changbang He, Jinshuai Zhang, Yiyu Mao, Wangyang Cai and Haimei Luo
Photonics 2022, 9(12), 905; https://doi.org/10.3390/photonics9120905 - 26 Nov 2022
Cited by 1 | Viewed by 1182
Abstract
We demonstrate a method to enhance the transverse Anderson localization (TAL) effect of the glass–air disordered optical fiber (G-DOF) by adjusting the number and diameter of air holes. This method does not need to enlarge the air-filling fraction of G-DOF, leading to the [...] Read more.
We demonstrate a method to enhance the transverse Anderson localization (TAL) effect of the glass–air disordered optical fiber (G-DOF) by adjusting the number and diameter of air holes. This method does not need to enlarge the air-filling fraction of G-DOF, leading to the mitigation of fabrication complexity. By choosing the appropriate diameter and number of air holes, the average localized beam radius of G-DOF with the highest air-filling fraction of 30% can be successfully reduced by 18%. Moreover, the proposed method is always functional for the situations of the air-filling fraction lower than 50%. We also identify that, under the same air-filling fraction, a larger number of air holes in the G-DOF leads to the smaller standard deviation of the corresponding localized beam radius, indicating a stable fiber structure. The results will provide new guidance on the G-DOF design. Full article
(This article belongs to the Special Issue Specialty Optical Fibers and Their High-Power Applications)
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