Demonstration of an All-Fiber Ultra-Low Numerical Aperture Ytterbium-Doped Large Mode Area Fiber in a Master Oscillator Power Amplifier Configuration Above 1 kW Power Level

Midilli, Yakup; Ortaç, Bülend

doi:10.1109/jlt.2020.2970213

Cited by 8 publications

(4 citation statements)

References 17 publications

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“…Furthermore, due to the photodarkening effect [82], the amount of doping concentration is limited, affecting the pump absorption level. Nevertheless, with technology development, there has been a significant improvement to overcome this limitation, especially with emerging high-brightness fiber-coupled laser diodes and progress in fabricating low NA fibers [80,81,83,84].…”

Section: Pumping Limitationsmentioning

confidence: 99%

Towards Ultimate High-Power Scaling: Coherent Beam Combining of Fiber Lasers

2021

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Fiber laser technology has been demonstrated as a versatile and reliable approach to laser source manufacturing with a wide range of applicability in various fields ranging from science to industry. The power/energy scaling of single-fiber laser systems has faced several fundamental limitations. To overcome them and to boost the power/energy level even further, combining the output powers of multiple lasers has become the primary approach. Among various combining techniques, the coherent beam combining of fiber amplification channels is the most promising approach, instrumenting ultra-high-power/energy lasers with near-diffraction-limited beam quality. This paper provides a comprehensive review of the progress of coherent beam combining for both continuous-wave and ultrafast fiber lasers. The concept of coherent beam combining from basic notions to specific details of methods, requirements, and challenges is discussed, along with reporting some practical architectures for both continuous and ultrafast fiber lasers.

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Section: Pumping Limitationsmentioning

confidence: 99%

Towards Ultimate High-Power Scaling: Coherent Beam Combining of Fiber Lasers

2021

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“…However, a large proportion of publicly reported results with more than 1 kW output power are realized by employing all freespace format except Ref. [18]. Such high-power systems are not only required to be compact and stable, but care must be taken to avoid dusts and moisture.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, free-space fiber laser architectures have separated optical components and are vulnerable to mechanical vibration. In fact, an all-fiberized laser scheme can get rid of all the disadvantages of the free-space architecture through the fiber fusion splice process and avoidance of free-space optical components [18][19][20] , which is preferable for practical applications.…”

Section: Introductionmentioning

confidence: 99%

5 kW-level single-mode fiber amplifier based on low-numerical-aperture fiber

Chen,

Ye,

Huang

et al. 2024

中国光学快报

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A low-numerical-aperture (NA) concept enables large-mode-area fiber with better single-mode operation ability, which is beneficial for transverse mode instability and nonlinear effects suppression. In this contribution, we reported a high-power fiber amplifier based on a piece of self-developed large-mode-area low-NA fiber with a core NA of 0.049 and a core/inner cladding diameter of 25/400 μm. The influence of the pump wavelength and fiber length on the power scaling potential of the fiber amplifier is systematically investigated. As a result, an output of 4.80 kW and a beam quality factor of ∼1.33 were finally obtained, which is the highest output power ever reported in a fiber amplifier exploiting the low-NA fiber. The results reveal that low-NA fibers have superiority in power scaling and beam quality maintenance at high power levels.

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“…In addition to the high efficiency in the fiber laser, the low quantum defect between the absorption and emission wavelengths of Yb 3+ ions yields relatively less heat generation, diffraction-limited beam quality, robustness, and reliability. Material processing [4], healthcare [5,6], defense industry [7], scientific research [8], and optical amplifier systems [9] are some emerging applications of Yb-doped fiber lasers. Furthermore, all Yb-doped fiber lasers become key, particularly in harsh radiation environments [10] since such active fibers are exploited within the applications in high energy physics or particle physics in tracking systems including calorimetry and triggering [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Effects of gamma radiation on Yb-doped Al–P–silicate optical fibers

et al. 2022

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Ytterbium (Yb)-doped optical fibers are mainly used in the fiber laser resonator and amplifier systems. These systems have been widely utilized for applications in air and space, the defense industry, and the medical field. Particularly for the applications yielding operation in harsh environments consisting of radiation, it is essential to determine the radiation hardness of the Yb-doped optical fibers and their long-term performance in such environments. This study analyzed the optical properties of four different Yb-doped aluminophosphosilicate fibers before and after gamma irradiation. For each fiber, the effect of different total dose values including 0.5, 1, 10, and 50 kGy were determined at different operation wavelengths, such as 495 nm, 590 nm, 685 nm, and 730 nm, using radiation-induced attenuation (RIA) analysing curves. The total dose values of 10 kGy and 50 kGy were studied to demonstrate the results under extreme environmental conditions such as large hadron colliders (LHCs). Our findings reveal that the formation of radiation-induced color centers (e.g. AlOHC, POHC, and NBOHC) are highly dependent on the Yb-concentration, the amount of excess alumina (Al 2 O 3 ) compared to the phosphorous pentoxide (P 2 O 5 ), total irradiation dose and wavelength at which the respective RIA is recorded.

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Demonstration of an All-Fiber Ultra-Low Numerical Aperture Ytterbium-Doped Large Mode Area Fiber in a Master Oscillator Power Amplifier Configuration Above 1 kW Power Level

Cited by 8 publications

References 17 publications

Towards Ultimate High-Power Scaling: Coherent Beam Combining of Fiber Lasers

Towards Ultimate High-Power Scaling: Coherent Beam Combining of Fiber Lasers

5 kW-level single-mode fiber amplifier based on low-numerical-aperture fiber

Effects of gamma radiation on Yb-doped Al–P–silicate optical fibers

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