An All-Fiber Ultra-Low Numerical Aperture High Power Fiber MOPA System with an Output Power above 500 W

Midilli, Yakup; Ortaç, Bülend

doi:10.1109/cleoe-eqec.2019.8872840

Cited by 2 publications

(4 citation statements)

References 4 publications

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“…However, maintaining the single-mode operation in large r core would only be possible if the core numerical aperture (N A core ) decreases. Realizing a high-brightness pump along with the low NA fibers has been faced fabrication challenges [9,[79][80][81]. Furthermore, due to the photodarkening effect [82], the amount of doping concentration is limited, affecting the pump absorption level.…”

Section: Pumping Limitationsmentioning

confidence: 99%

“…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%

“…There has been much research on optimizing the fiber structure to keep the single-mode operation in the largest core size, mainly by decreasing the core NA of the fibers. Some technical challenges have limited the core NA to 0.06 in the commercial ones, although the ultra-low NA of 0.032 is reported by Midilli et al in 2019 [80].…”

mentioning

confidence: 99%

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

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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%

Section: Pumping Limitationsmentioning

confidence: 99%

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

2021

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“…However, maintaining the single-mode operation in large 𝑟 would only be possible if the core numerical aperture (𝑁𝐴 ) decreases. Realizing high brightness pump along with the low NA fibers have been faced fabrication challenges [9, [79][80][81]. Furthermore, due to the photodarkening effect [82], the amount of doping concentration is limited, affecting the pump absorption level.…”

Section: Pumping Limitationsmentioning

confidence: 99%

Towards Ultimate High-power Scaling: Coherent Beam Combing of Fiber Lasers

Fathi¹,

Närhi²,

Gumenyuk³

2021

Preprint

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Fiber laser technology has been demonstrated as a versatile and reliable approach for 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 are discussed, along with reporting some practical architectures for both continuous and ultrafast fiber lasers.

show abstract

An All-Fiber Ultra-Low Numerical Aperture High Power Fiber MOPA System with an Output Power above 500 W

Cited by 2 publications

References 4 publications

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

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

Towards Ultimate High-power Scaling: Coherent Beam Combing of Fiber Lasers

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