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Photonics
Special Issues
High-Power Fiber Lasers
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High-Power Fiber Lasers

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

Deadline for manuscript submissions: 20 September 2025 | Viewed by 9119

Special Issue Editor

Dr. Xiaolin Wang

E-Mail Website
Guest Editor
College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China
Interests: high-power fiber lasers

Special Issue Information

Dear Colleagues,

In 1961, just one year after the invention of the laser, the first demonstration of a fiber laser marked a milestone. Subsequent advancements, particularly in 1988 with the introduction of double-clad fiber, enabled an increase in the output power from mere milliwatts to substantial watts. The progression continued into the 21st century, witnessing a further increase in the power of fiber lasers utilizing ytterbium ion as the gain medium—from 100 W to 100 kW. Presently, high-power fiber lasers have found extensive applications in scientific research, industry and medicine, owing to their advantages such as high efficiency, high beam quality and flexible power transmission. Notably, these lasers have greatly advanced the applications of laser cutting, welding, cleaning, and additive manufacturing, thereby significantly promoting the development of sectors such as automobiles, shipbuilding, and aerospace. At the technical level, fiber lasers are evolving towards laser structure optimization, wavelength band extension, time domain adjustability, transverse mode controllability and power scaling. At the practical level, fiber lasers are aiming for high power, high efficiency, high beam quality, high reliability, high stability and low cost. Recent years have witnessed the emergence of novel laser structures, innovative optical fibers, and new pump source technologies. Furthermore, the integration of artificial intelligence technology has added new potentials to this evolution. We believe that the improved performance and expanded applications of high-power fiber lasers will make them more effective in serving the economy and benefiting human society.

This Special Issue aims to publish high-quality papers that study emerging and practical technologies in high-power fiber lasers. Research areas may include (but are not limited to) the following topics:

  • High-power ytterbium-doped fiber lasers;
  • High-power continuous wave fiber laser;
  • High-peak-power pulsed fiber laser;
  • High-power near-single-mode fiber laser;
  • High-power fiber laser oscillator;
  • High-power fiber laser amplifier;
  • High-power oscillator amplifier integrated laser;
  • Nonlinear effect in high-power fiber lasers;
  • Transverse mode instability in high-power fiber laser;
  • Fast simulation and modeling of high-power fiber laser;
  • High-power single-frequency fiber amplifier;
  • High-power narrow-line-width fiber amplifier;
  • High-power fiber laser components;
  • Novel transverse and longitudinal parameter controlled fiber;
  • High-power crystal fiber;
  • Ytterbium-doped short- and long-wavelength fiber laser;
  • High-power novel wavelength laser such as green fiber laser;
  • High-power-beam combined fiber laser;
  • Other high-power fiber lasers and laser components.

Dr. Xiaolin Wang
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Photonics is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • ytterbium-doped fiber laser
  • fiber laser oscillator
  • fiber laser amplifier
  • multi cladding fiber
  • transverse mode instability
  • nonlinear effect
  • single-frequency fiber laser
  • narrow-linewidth fiber laser
  • pulsed fiber laser
  • quasi-continuous-wave fiber laser

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Published Papers (6 papers)

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Research

7 pages, 1613 KiB  
Communication
1010 nm Directly LD-Pumped 6kW Monolithic Fiber Laser Employing Long-Tapered Yb3+-Doped Fiber
by Mingye Yang, Peng Wang, Xiaoyong Xu, Hanshuo Wu, Zhiyong Pan, Yun Ye, Zhiping Yan, Xiaoming Xi, Hanwei Zhang and Xiaolin Wang
Photonics 2024, 11(11), 1033; https://doi.org/10.3390/photonics11111033 - 2 Nov 2024
Viewed by 1179
Abstract
Utilizing long-wavelength laser diodes (LDs) for pumping to achieve high-power fiber laser output is an effective method for attaining high quantum efficiency and excellent thermal management. In this work, we report on a Master Oscillator Power Amplifier (MOPA)-structured long-tapered Yb3+-doped fiber [...] Read more.
Utilizing long-wavelength laser diodes (LDs) for pumping to achieve high-power fiber laser output is an effective method for attaining high quantum efficiency and excellent thermal management. In this work, we report on a Master Oscillator Power Amplifier (MOPA)-structured long-tapered Yb3+-doped fiber laser directly pumped by long-wavelength laser diodes. By shifting the center wavelength of the pump source to 1010 nm, the heat generation within the fiber laser is effectively controlled, thereby increasing the transverse mode instability (TMI) threshold. Additionally, the use of a long-tapered fiber enlarges the mode area and suppresses stimulated Raman scattering (SRS) effects that typically arise from increased fiber length. As a result, an output of 6030 W is achieved with an optical-to-optical (O–O) efficiency of 83.7%, a SRS suppression ratio exceeding 50 dB, and no occurrence of dynamic TMI. This approach provides a valuable reference for optimizing long-wavelength pumping to suppress nonlinear effects and also holds potential for wide-temperature operational applications. Full article
(This article belongs to the Special Issue High-Power Fiber Lasers)
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10 pages, 4214 KiB  
Article
SBS Mitigation by Manipulating the Injecting Polarization Direction in a High-Power Monolithic PM Amplifier
by Yu Wen, Chun Zhang, Chenxu Liu, Qiuhui Chu, Lingli Huang, Yuan Zhu, Haoyu Zhang, Rumao Tao, Honghuan Lin and Jianjun Wang
Photonics 2024, 11(9), 890; https://doi.org/10.3390/photonics11090890 - 21 Sep 2024
Viewed by 973
Abstract
The polarization direction-dependent SBS threshold was investigated, and the terminal polarization control technique was demonstrated to restore the linear polarization state. By increasing the relative angle of the injecting polarization direction from 0° to 90°, the measured SBS threshold increased until reaching a [...] Read more.
The polarization direction-dependent SBS threshold was investigated, and the terminal polarization control technique was demonstrated to restore the linear polarization state. By increasing the relative angle of the injecting polarization direction from 0° to 90°, the measured SBS threshold increased until reaching a maximum value, beyond which it decreased in a nearly symmetrical trend. The highest SBS threshold was achieved with the relative polarization angle being 45°, delivering a 67% threshold enhancement compared with that at 0°. A quarter-wave-plate was used to restore the polarization state of the output laser manually from an elliptic to a linearly polarized state, and temperature-dependent polarization fluctuation was observed, which intensified as the laser power was scaled. By reducing the cooling temperature, a 1 kW laser with a linearly polarized state was demonstrated using a 45° polarization direction-injected monolithic PM amplifier. Full article
(This article belongs to the Special Issue High-Power Fiber Lasers)
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13 pages, 3642 KiB  
Article
A Fast Solution of the Dynamic Rate Equation for a High-Power Fiber Laser
by Lei Duan, Runqin Xu, Shudan Tan, Xiongxin Tang and Fanjiang Xu
Photonics 2024, 11(9), 881; https://doi.org/10.3390/photonics11090881 - 19 Sep 2024
Viewed by 1168
Abstract
In the study of dynamic behaviors, such as nonlinear effects, power evolution, and pulse evolution of light in fiber gain media, solving dynamic rate equations in fiber laser systems is involved, which is computationally intensive and directly affects overall computational efficiency. A modified [...] Read more.
In the study of dynamic behaviors, such as nonlinear effects, power evolution, and pulse evolution of light in fiber gain media, solving dynamic rate equations in fiber laser systems is involved, which is computationally intensive and directly affects overall computational efficiency. A modified difference scheme is proposed to solve fiber dynamic rate equations efficiently. The advantages of the improved scheme and its convergence rate are analyzed. By incorporating a correction coefficient into the finite difference, the approximations of spatial and temporal derivatives are improved, greatly enhancing the performance of the numerical method. The computational results of the proposed method are compared with those of the conventional upwind difference scheme, demonstrating that the improved method is more stable and requires fewer sampling points to maintain a certain level of precision, thereby saving significant computation time and computational resources. The power and spectral evolutions of the fiber laser oscillator under different pump conditions are simulated and compared with experimental data, validating the applicability and reliability of the rapid solving method. Full article
(This article belongs to the Special Issue High-Power Fiber Lasers)
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13 pages, 2877 KiB  
Article
Modeling of High-Power Graded-Index Fiber Amplifiers
by Anuj P. Lara, Samudra Roy and Govind P. Agrawal
Photonics 2024, 11(8), 737; https://doi.org/10.3390/photonics11080737 - 7 Aug 2024
Cited by 1 | Viewed by 1091
Abstract
Graded-index fibers have been used in recent years to make high-power fiber lasers and amplifiers. Such fibers exhibit self-imaging, a phenomenon in which any optical beam periodically reproduces its original shape in undoped fibers (no gain). In this work, we employed analytic and [...] Read more.
Graded-index fibers have been used in recent years to make high-power fiber lasers and amplifiers. Such fibers exhibit self-imaging, a phenomenon in which any optical beam periodically reproduces its original shape in undoped fibers (no gain). In this work, we employed analytic and numerical techniques to study how self-imaging affects the evolution of a signal beam inside a nonlinear graded-index fiber amplifier, doped with a rare-earth element and pumped optically to provide gain all along its length. We also exploited the variational technique to reduce the computing time and to provide physical insights into the amplification process. We compared the variational and fully numerical results for the two pumping schemes (clad pumping and edge pumping) commonly used for high-power fiber amplifiers and show that the variational results are reliable in most cases of practical interest. The stability of the signal beam undergoing amplification is examined numerically by launching a noisy Gaussian beam at the input end of the amplifier. Our results show that the quality of the amplified beam should improve in the case of edge pumping when a narrower pump beam provides an optical gain that varies considerably in the radial direction of the fiber. Such an improvement does not occur for the clad pumping scheme, for which the use of a relatively wide pump beam results in a nearly uniform gain all along the fiber. Full article
(This article belongs to the Special Issue High-Power Fiber Lasers)
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11 pages, 4300 KiB  
Article
Polarimeter Optical Spectrum Analyzer
by Eyal Buks
Photonics 2024, 11(6), 486; https://doi.org/10.3390/photonics11060486 - 21 May 2024
Cited by 2 | Viewed by 1007
Abstract
A coherent optical spectrum analyzer is integrated with a rotating quarter wave plate polarimeter. The combined polarimeter optical spectrum analyzer (POSA) allows the extraction of the state of polarization with high spectral resolution. The POSA is used in this work to study two [...] Read more.
A coherent optical spectrum analyzer is integrated with a rotating quarter wave plate polarimeter. The combined polarimeter optical spectrum analyzer (POSA) allows the extraction of the state of polarization with high spectral resolution. The POSA is used in this work to study two optical systems. The first is an optical modulator based on a ferrimagnetic sphere resonator. The POSA is employed to explore the underlying magneto–optical mechanism responsible for modulation sideband asymmetry. The second system under study is a cryogenic fiber loop laser, which produces an unequally spaced optical comb. The polarization measurements provide insights into the nonlinear processes responsible for comb creation. Characterizations extracted from the POSA data provide guidelines for the performance optimization of applications based on the systems under study. Full article
(This article belongs to the Special Issue High-Power Fiber Lasers)
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15 pages, 5105 KiB  
Article
Emission Wavelength Limits of a Continuous-Wave Thulium-Doped Fiber Laser Source Operating at 1.94 µm, 2.09 µm or 2.12 µm
by Christophe Louot, Félix Sanson, Arnaud Motard, Thierry Ibach, Inka Manek-Hönninger, Antoine Berrou, Nicolas Dalloz, Thierry Robin, Benoit Cadier and Anne Hildenbrand-Dhollande
Photonics 2024, 11(3), 246; https://doi.org/10.3390/photonics11030246 - 9 Mar 2024
Cited by 5 | Viewed by 2780
Abstract
We present a thulium-doped single-oscillator monolithic fiber laser emitting successively at three wavelengths, especially at unusual long wavelengths as 2.09 µm and even at 2.12 µm. The 793 nm core absorption of 8.42 dB/m allows for achieving a slope efficiency higher than 43% [...] Read more.
We present a thulium-doped single-oscillator monolithic fiber laser emitting successively at three wavelengths, especially at unusual long wavelengths as 2.09 µm and even at 2.12 µm. The 793 nm core absorption of 8.42 dB/m allows for achieving a slope efficiency higher than 43% both at 1.94 µm and 2.09 µm. The operation of the laser at 1.94 µm, 2.09 µm, and 2.12 µm is compared by using different fiber Bragg gratings to push the limit of thulium ions emission above 2.05 µm. This is the first demonstration of emission exceeding wavelengths of 2.1 µm of an only thulium-doped fiber laser, to the best of our knowledge. Full article
(This article belongs to the Special Issue High-Power Fiber Lasers)
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