High Power Fiber Laser and Amplifiers

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

Deadline for manuscript submissions: closed (10 December 2023) | Viewed by 7954

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Guest Editor
Department of Precision Instrument, Tsinghua University, Beijing 100084, China
Interests: fiber optics; two-dimensional materials; nanophotonics
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Special Issue Information

Dear Colleagues,

High-power fiber lasers and amplifiers are used in a wide range of applications due to their excellent beam quality, high efficiency, and flexible operation. Power boosting is always an attractive topic in this field. At present, researchers also focus on the beam quality, output spectrum, temporal intensity, and the coherence of high-power fiber laser systems to improve their properties. Narrow-linewidth fiber lasers, polarization-maintaining fiber lasers, random fiber lasers, and other special fiber lasers have been demonstrated with high output power. They promise a brighter future for high-power fiber lasers and amplifiers.

In this technology, nonlinear effects and mode dynamics under high-power-density conditions are attractive. The mechanism of stimulated Raman scattering, stimulated Brillouin scattering, transverse modal instability, etc., has been analyzed experimentally and theoretically. Wavelength extension and brightness enhancement of the traditional fiber lasers often take advantage of these phenomena. However, the power limitation of the high-power fiber lasers and amplifiers still exists. Circumvention of the beam quality deterioration and spectral broadening at higher power level will always be a challenging issue. Special fiber and fiber components with excellent performance under higher-power conditions are still urgently needed.

This Special Issue aims to present the state-of-the-art technologies in high-power fiber lasers and amplifiers, including demonstration of novel high-power fiber laser systems with extraordinary properties, special fiber components in the high-power fiber laser systems, and the study of phenomena which limit the properties of fiber laser systems.

In this Special Issue, original research articles and reviews are welcome. Research areas may include (but are not limited to) the following:

  • Power scaling of high-power fiber lasers and amplifiers.
  • High-power fiber lasers and amplifiers with special properties, including high-power narrow-linewidth fiber lasers and amplifiers, high-power polarization-maintaining fiber lasers and amplifiers, and so forth.
  • Design and fabrication of the specialty optical fibers for power boosting, and design and fabrication of fiber components applied in a high-power fiber laser system, including pump combiners, fiber gratings, cladding light strippers, and so forth.
  • Transverse mode evolution in the high-power fiber laser and amplifier systems; beam quality evolution during power boosting; and brightness enhancement of high-power fiber lasers and amplifiers.
  • Nonlinear dynamics in high-power fiber lasers and amplifiers; suppression of the nonlinear effects, such as stimulated Raman scattering and stimulated Brillouin scattering; and wavelength extension of high-power fiber lasers and amplifiers.
  • High-power fiber lasers and amplifiers beyond the traditional mechanism of feedback, rare-earth gain, and pump scheme, including high-power random fiber lasers and amplifiers, high-power Raman fiber lasers and amplifiers, and so forth.
  • Applications of high-power fiber lasers and amplifiers.

We look forward to receiving your contributions.

Dr. Qirong Xiao
Guest Editor

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Keywords

  • high-power fiber laser and amplifier
  • fiber design and fabrication
  • fiber grating
  • pump combiner
  • mode dynamics
  • stimulated Raman scattering
  • stimulated Brillouin scattering
  • fiber laser application

Published Papers (6 papers)

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Research

15 pages, 2384 KiB  
Article
Picosecond Pulse Tapered Fiber Amplifier Operated near 1030 nm with Peak Power up to 1 MW
by Egor K. Mikhailov, Konstantin K. Bobkov, Andrey E. Levchenko, Vladimir V. Velmiskin, Dmitry V. Khudyakov, Svetlana S. Aleshkina, Tatiana S. Zaushitsyna, Mikhail M. Bubnov, Denis S. Lipatov and Mikhail E. Likhachev
Photonics 2023, 10(12), 1385; https://doi.org/10.3390/photonics10121385 - 16 Dec 2023
Viewed by 1109
Abstract
We demonstrated an optimization of a picosecond fiber amplifier based on Yb-doped tapered fiber in a spectral range of 1030 nm. Nonlinear effects limiting peak power scaling (stimulated Raman scattering and four-wave mixing) were studied and factors affecting their threshold were established, such [...] Read more.
We demonstrated an optimization of a picosecond fiber amplifier based on Yb-doped tapered fiber in a spectral range of 1030 nm. Nonlinear effects limiting peak power scaling (stimulated Raman scattering and four-wave mixing) were studied and factors affecting their threshold were established, such as gain, diameter profile along the length of taper, output mode field diameter, and numerical aperture of a pump. By determining the optimal amplification regime and manufacturing advanced tapered fibers, we amplified 13 ps pulses to a record-high peak power of 1 MW at a wavelength of 1029 nm directly at the output of the fiber at an average power of 13.8 W. Four-wave mixing was the limiting factor, and the total fraction of deleterious components in the output spectrum was ~2%. The quality of the output beam was close to being diffraction limited (M2 < 1.2). Full article
(This article belongs to the Special Issue High Power Fiber Laser and Amplifiers)
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10 pages, 2623 KiB  
Article
Research of Transverse Mode Instability in High-Power Bidirectional Output Yb-Doped Fiber Laser Oscillators
by Fengchang Li, Xinyi Ding, Peng Wang, Baolai Yang, Xiaoming Xi, Hanwei Zhang, Xiaolin Wang and Jinbao Chen
Photonics 2023, 10(8), 912; https://doi.org/10.3390/photonics10080912 - 9 Aug 2023
Viewed by 965
Abstract
Bidirectional output fiber laser oscillators can realize two high-power laser outputs employing only a single-laser resonant cavity and hold the advantages of being low cost and of compact size. However, like other fiber lasers, their power improvement is limited by transverse mode instability [...] Read more.
Bidirectional output fiber laser oscillators can realize two high-power laser outputs employing only a single-laser resonant cavity and hold the advantages of being low cost and of compact size. However, like other fiber lasers, their power improvement is limited by transverse mode instability (TMI). To achieve higher power output, in this paper, the characteristics and corresponding suppression method of the TMI in bidirectional output fiber laser oscillators were investigated for the first time. Firstly, the TMI threshold was obtained when the fiber laser oscillator was pumped by 976 nm LDs and 981 nm LDs, separately, and the difference between the two pumping conditions was researched in detail. After that, a comparison study between the bidirectional and unidirectional output fiber laser oscillators pumped by 981 nm LDs was carried out. In the experiment, the effect of pump distribution on the TMI threshold was also considered. The results show that the TMI threshold of the bidirectional-output laser pumped by 981 nm LDs is much higher than that pump by 976 nm LDs, which means that the effective TMI suppression methods in the unidirectional output laser are also applicable in the bidirectional output laser. In addition, it is found that the TMI threshold of a bidirectional output fiber laser is much lower than that of a unidirectional output fiber laser. Full article
(This article belongs to the Special Issue High Power Fiber Laser and Amplifiers)
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10 pages, 3291 KiB  
Communication
Efficient 1054 nm Raman Random Fiber Laser
by Pan Wang, Shengtao Lin, Jiaojiao Zhang, Xingyu Bao, Longqun Ni, Yifei Qi and Zinan Wang
Photonics 2023, 10(7), 851; https://doi.org/10.3390/photonics10070851 - 22 Jul 2023
Cited by 2 | Viewed by 1175
Abstract
Low–coherence laser is regarded as the key to mitigating laser–plasma instability (LPI) in laser–driven inertial confinement fusion (ICF), where LPI can decrease the laser energy coupled to the target. With the merits of low coherence, high spectral stability, and flexible output characteristics, the [...] Read more.
Low–coherence laser is regarded as the key to mitigating laser–plasma instability (LPI) in laser–driven inertial confinement fusion (ICF), where LPI can decrease the laser energy coupled to the target. With the merits of low coherence, high spectral stability, and flexible output characteristics, the Raman random fiber laser (RRFL) is considered to be a candidate light source in ICF. In this paper, the 1054 nm RRFL with high slope efficiency is achieved for the first time. In the RRFL pump source design section, we have optimized the ytterbium–doped fiber (YDF) length by simulation and amplified the power by Master Oscillator Power Amplifier (MOPA) to realize a 1011 nm YDF laser with 47.3 dB optical signal–to–noise ratio (OSNR). In terms of RRFL cavity design, a fiber loop mirror and Rayleigh scattering in the HI 1060 Flex fiber provide wideband point feedback and random distributed feedback, respectively. Based on this system, we achieve an RRFL output with 0.4 nm half–maximum full width, 182% slope efficiency, and 41.3 dB OSNR. This work will provide guidance for the application of RRFL in high–energy–density physics research. Full article
(This article belongs to the Special Issue High Power Fiber Laser and Amplifiers)
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8 pages, 1838 KiB  
Communication
Improved Radiation Resistance of Er-Yb Co-Doped Silica Fiber by Pretreating Fibers
by Yiming Zhu, Chongyun Shao, Fan Wang, Meng Wang, Lei Zhang, Ye Dai, Chunlei Yu and Lili Hu
Photonics 2023, 10(4), 414; https://doi.org/10.3390/photonics10040414 - 6 Apr 2023
Cited by 2 | Viewed by 1194
Abstract
In this study, a pretreatment method for improving the radiation resistance of Er-Yb co-doped silica fiber (EYDF) is proposed. EYDF is the object in this method and is processed by two steps, including deuterium loading and pre-irradiation. The effects of pretreatment conditions on [...] Read more.
In this study, a pretreatment method for improving the radiation resistance of Er-Yb co-doped silica fiber (EYDF) is proposed. EYDF is the object in this method and is processed by two steps, including deuterium loading and pre-irradiation. The effects of pretreatment conditions on the laser performance and radiation resistance of EYDF were systematically studied. An online irradiation experiment setup was utilized to evaluate the radiation resistance of EYDF. The results demonstrate that the pretreatment can significantly improve the radiation resistance of EYDF, with minimal impact on the laser output power and slope efficiency. Specifically, the radiation-induced gain variations in the pristine fiber and the pretreated fiber with a cumulative dose of 240 krad were 3.13 dB and 1.81 dB, respectively. Additionally, the high-vacuum experiments show that the proposed pretreatment method can maintain a long-term stable radiation resistance improvement in the fiber. This study provides a method to improve the radiation resistance of EYDF for space applications. Full article
(This article belongs to the Special Issue High Power Fiber Laser and Amplifiers)
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7 pages, 1924 KiB  
Communication
Intra-Cavity Raman Laser Operating at 1193 nm Based on Graded-Index Fiber
by Chunhua Hu and Ping Sun
Photonics 2023, 10(1), 33; https://doi.org/10.3390/photonics10010033 - 28 Dec 2022
Viewed by 1334
Abstract
Nonlinear Raman frequency conversion is an important technical scheme to obtain special optical band lasers based on conventional ion-doped lasers. In our work, we designed an intra-cavity Raman fiber laser based on graded index fiber (GRIF) as the Raman gain medium. Based on [...] Read more.
Nonlinear Raman frequency conversion is an important technical scheme to obtain special optical band lasers based on conventional ion-doped lasers. In our work, we designed an intra-cavity Raman fiber laser based on graded index fiber (GRIF) as the Raman gain medium. Based on the fundamental-frequency 1080-nanometer laser, efficient first-order and second-order Stokes Raman lasers were obtained, respectively. When the power of the fundamental-frequency 1080-nanometer laser was 33.4 W, the output power of the second-order 1193-nanometer laser was 11.39 W. The corresponding conversion efficiency was 34.1%. To our knowledge, this is the first report of a second-order Raman output based on a GRIF and intra-cavity structure. In the experiment, the spectrum-purification process with the increase in power was also observed. Our experimental results prove that the intracavity Raman-laser system based on graded index fiber with a high optical conversion efficiency has important application potential for obtaining new special-application bands. Full article
(This article belongs to the Special Issue High Power Fiber Laser and Amplifiers)
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12 pages, 2973 KiB  
Article
10-Watt-Level 1.7 μm Random Fiber Laser with Super-High Spectral Purity in a Cost-Effective and Robust Structure
by Wangcheng Gao, Xin Quan, Rui Ma, Yu Chen, Shixiang Xu, Xiaochao Wang, Dianyuan Fan and Jun Liu
Photonics 2022, 9(12), 900; https://doi.org/10.3390/photonics9120900 - 24 Nov 2022
Cited by 7 | Viewed by 1430
Abstract
The 1.7 μm band eye-safe laser sources have recently received lots of attention thanks to the development of various applications. Although a variety of lasing configurations operating in this band have been demonstrated, one still needs to seek a good candidate for particular [...] Read more.
The 1.7 μm band eye-safe laser sources have recently received lots of attention thanks to the development of various applications. Although a variety of lasing configurations operating in this band have been demonstrated, one still needs to seek a good candidate for particular applications with a reasonable compromise between the relative performance targets (e.g., stability, output power, and spectral purity) and the construction cost. Here, we demonstrate a high-power 1694 nm random fiber laser (RFL) in a cost-effective structure pumped by a high-powered 1565 nm RFL. The maximum output power reached the 10 W level, and the output showed extremely low-intensity fluctuations for both the short-time and long-time regimes. Meanwhile, an excellent spectral purity as high as 26.9 dB was also realized. This work provides one of the most attractive approaches for constructing high-performance 1.7 μm band laser sources for practical applications. Full article
(This article belongs to the Special Issue High Power Fiber Laser and Amplifiers)
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