Six kilowatt record all-fiberized and narrow-linewidth fiber amplifier with near-diffraction-limited beam quality

Wang, Guangjian; Song, Jiaxin; Chen, Yisha; Ren, Shuai; Ma, Pengfei; Liu, Wei; Yao, Tianfu; Zhang, Pu

doi:10.1017/hpl.2022.12

Cited by 34 publications

(8 citation statements)

References 28 publications

(27 reference statements)

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“…[78,79] To comprehend the absorption mechanism, the equivalent circuit theory has been broadly utilized. [80][81][82][83][84] Representing periodic patterns through the resistance-inductance-capacitance (RLC) circuit model, where the equivalent impedance (Z u ) can be described in Equation (1) [85][86][87]…”

Section: Design Principles and Methods Of Absorbersmentioning

confidence: 99%

Research Progress in Tunable Metamaterial Absorbers

Liu,

Li,

Fang

et al. 2023

Advanced Photonics Research

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Since the initial discovery of metamaterial absorbers (MAs), they generate significant interest across the electromagnetic device industry due to their capacity to attain subwavelength magnitudes, adaptable design, and almost complete absorption. In recent years, there has been a growing focus on incorporating active materials into MAs, making it a current focal point of investigation. In the past few years, MAs have seen the integration of various active materials and configurations thanks to continuous exploration and innovation. Herein, comprehensive and systematic research on different tuning methods of MAs is reviewed, highlighting innovative materials and unique designs to accurately control the electromagnetic absorption characteristics of MAs. Key parameters, such as the operating frequency and relative tuning range, are summarized and compared to provide guidance for optimization design. Finally, the challenges of tunable MAs and their future prospects are also summarized.

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Section: Design Principles and Methods Of Absorbersmentioning

confidence: 99%

Research Progress in Tunable Metamaterial Absorbers

Liu,

Li,

Fang

et al. 2023

Advanced Photonics Research

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“…By comprehensively suppress the SRS effect and TMI effect, 6 kW narrow-linewidth fiber amplifier has been achieved by our group which has been published in Ref [10]. More recently, based on the in-house made ultra-low NA largemode-field fiber, our group took the comprehensive suppression of SBS, SRS and TMI into account, by optimizing the coiling condition and the power share of bidirectional LD pump power, making the laser output power of high beam quality and narrow line width fiber further break through the 7 kW level.…”

Section: Kw Narrow-linewidth Fiber Amplifiermentioning

confidence: 99%

“…In recent years, numerous progresses in power scaling of narrow linewidth fiber lasers based on MOPA configuration have been reported by effectively suppress the nonlinear effects and the TMI effect. As for the stochastic-polarized narrow-linewidth fiber lasers, up to 5 kW power-level all-fiber lasers have been achieved [8,9] and the power-level has been improved as high as 6 kW quite recently [10]. For the linear-polarized ones, > 2 kW output power have been reported [11][12][13][14] in the last five years and the maximum power scaling has been scaled to 5 kW this year [15].…”

Section: Introductionmentioning

confidence: 99%

New progress of high-power narrow-linewidth fiber lasers

Yao

Chen

et al. 2022

Advanced Lasers, High-Power Lasers, and Applications XIII

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High power narrow-linewidth fiber lasers have been highly desired for various applications. In this paper, we presented new considerations of high power narrow-linewidth fiber amplifiers operating within 1030~1060 nm by using newgeometry active fiber, and the power-breakthrough operating at 1050 nm was achieved. We also reported our recent achievements on power scaling of high-power narrow-linewidth fiber lasers which operates within 1060~1080 nm based on system-optimized step-index and confined-doped active fibers, including linear-polarized and stochastic-polarized ones. Meanwhile, our new progress on special designed active fibers assisted high power fiber amplifiers with sub-GHz to within 1.5 GHz were demonstrated. Besides, the basic considerations of end-reflection on the SBS and SRS effects will be discussed, which provide a new insight for the suppression of SBS and SRS effects.

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“…All these outstanding characteristics make them ideal sources in the various fields of industrial processing, such as cutting, welding, and micromachining [ 1 , 2 , 3 ], which require the continuous scaling of laser power. With the development of pump brightness and the manufacturing technique of double-clad (DC) fiber, the output power of fiber lasers has experienced a remarkable increase [ 7 , 8 , 9 , 10 ], while the application of fiber lasers in industrial processing has reached an unprecedented depth and breadth [ 11 , 12 ]. In some application scenarios, fiber lasers are challenged by harsh environments and/or strong reflecting light.…”

Section: Introductionmentioning

confidence: 99%

A 3.7-kW Oscillating-Amplifying Integrated Fiber Laser Featuring a Compact Oval-Shaped Cylinder Package

et al. 2023

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Combining the advantages of high efficiency, environmental robustness, and anti-reflection behavior, oscillating-amplifying integrated fiber lasers have become popular for use in high-power laser structures in industrial applications, wherein the size of the laser source matters. Here, an oscillating-amplifying integrated fiber laser in an oval-shaped cylinder package has been proposed and demonstrated, the footprint for which only occupies an area of 0.024 m2 apart from the pump diode, which is much smaller than in traditional planar fiber laser packages. Numerical simulations have been carried out, which have revealed that an oval-shaped cylinder package can effectively suppress the high-order mode in large mode area fiber setups and thereby benefit the integration of fusion points and the unpackaged elements at the same time. Over 3.7 kW of transverse mode instability (TMI)-free output power has been obtained, with a slope efficiency higher than 80%. With a custom-made chirped and tilted fiber Bragg grating (CTFBG), the Raman suppression ratio is improved to reach 38 dB at peak output power. The oval-shaped design has been verified to assist with the realization of TMI suppression and improve the integration of high-power fiber lasers. To the best of our knowledge, this fiber laser has among the smallest footprints of the various fiber sources at such high-power operating levels.

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Six kilowatt record all-fiberized and narrow-linewidth fiber amplifier with near-diffraction-limited beam quality

Cited by 34 publications

References 28 publications

Research Progress in Tunable Metamaterial Absorbers

Research Progress in Tunable Metamaterial Absorbers

New progress of high-power narrow-linewidth fiber lasers

A 3.7-kW Oscillating-Amplifying Integrated Fiber Laser Featuring a Compact Oval-Shaped Cylinder Package

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