2 kW single-mode fiber laser with 20-m long delivery fiber and high SRS suppression

Mashiko, Y.; Nguyen, Hoang; Kashiwagi, M.; Kitabayashi, T.; Shima, K.; Tanaka, D.

doi:10.1117/12.2212049

Cited by 29 publications

(19 citation statements)

References 2 publications

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“…On the basis of cladding-pump technology, high-power multimode LDs at 790 nm and highly Tm-doped fibers, the output power of HPFLs exploiting Tm-doped fibers has exceeded the power level of Er-doped fibers gradually and a kilowatt-level output [102] has been achieved as early as 2010, representing the highest CW output power produced by Tm-doped fiber reported publicly currently. In 2018, a Tm-doped chirped pulse amplifier system with a record average power of up to 1150 W and the peak power of more than 5 GW was demonstrated, which brings exciting prospects for [46][47][48][49][50][51][52][53][54][55][56][57][58][59][60][61][62][63], c all-fiber laser amplifiers operating at ~ 1 μm [13, 14, 16-19, 35, 64-83], d all-fiber Er-doped lasers and Er-Ybco-doped lasers operating at ~ 1.5 μm , e all-fiber Tm-doped lasers operating at ~ 2 μm [94][95][96][97][98][99][100][101][102][103][104][105][106][107][108][109][110][111][112][113]. f Emission cross sections of Er 3+ , Ho 3+ and Dy 3+ ions in mid-infrared waveband [114].…”

Section: Records For Laser Fibers Operating At 1-2 μM (Near-infrared ...mentioning

confidence: 99%

“…All-fiberized oscillators exploiting dual-end FBGs were developed unprecedentedly in recent years. Since 2015, the power record created by Fujikura Inc. experienced a dramatic increase [48,51,52,59]. To date, the directly generated single-mode laser power from monolithic fiber oscillator based on dual-end FBGs has exceeded ∼8 kW [59], where a piece of specially designed active fiber plays a key role.…”

Section: Fiber Bragg Grating (Fbg)mentioning

confidence: 99%

“…After the TMI effect was observed experimentally and regarded as the main limiting factor for power scaling of HPFLs, researchers have predicted that the confined-doped fiber is an effective method to improve the TMI threshold of laser system [20] due to the gain tailoring effect among the guided modes. High-power fiber lasers/ amplifiers employing confined-doped ytterbium-doped fiber have made continuous breakthroughs in power scaling and beam quality preservation [35,48,51,52,59,71,[292][293][294][295][296][297][298][299][300][301][302][303][304][305][306][307][308][309] in recent years.…”

Section: Doping Components Engineeringmentioning

confidence: 99%

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Functional Fibers and Functional Fiber-Based Components for High-Power Lasers

et al. 2022

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The success of high-power fiber lasers is fueled by maturation of active and passive fibers, combined with the availability of high-power fiber-based components. In this contribution, we first overview the enormous potential of rare-earth doped fibers in spectral coverage and recent developments of key fiber-based components employed in high-power laser systems. Subsequently, the emerging functional active and passive fibers in recent years, which exhibit tremendous advantages in balancing or mitigating parasitic nonlinearities hindering high-power transmission, are outlined from the perspectives of geometric and material engineering. Finally, novel functional applications of conventional fiber-based components for nonlinear suppression or spatial mode selection, and correspondingly, the high-power progress of function fiber-based components in power handling are introduced, which suggest more flexible controllability on high-power laser operations. Graphical abstract

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Section: Records For Laser Fibers Operating At 1-2 μM (Near-infrared ...mentioning

confidence: 99%

Section: Fiber Bragg Grating (Fbg)mentioning

confidence: 99%

Section: Doping Components Engineeringmentioning

confidence: 99%

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Functional Fibers and Functional Fiber-Based Components for High-Power Lasers

et al. 2022

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“…Digital Object Identifier 10.1109/JPHOT.2022.3143501 using their home-made DCFs with an effective core area of 400 µm 2 [3]. In 2018, national university of defense technology and Fujikura company successively reported single mode 5 kW-level all-fiber oscillators [4], [5].…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Fiber Bragg Gratings by Visible Femtosecond Laser for Multi-kW Fiber Oscillator

Tian

Wang

et al. 2022

IEEE Photonics J.

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In this paper, we fabricate a pair of fiber Bragg gratings (FBGs) in large mode area double cladding fiber (LMA-DCF, core/inner cladding diameter: 20/400 µm) by visible (515 nm) femtosecond laser and phase mask for the first time to the best of our knowledge. Then this pair of FBGs are utilized to construct a high power fiber oscillator operated near 1080 nm. The maximum output laser power is more than 3.2 kW with a slope efficiency of ∼77.9%, and the beam quality factor M 2 is about 1.28. The FBGs are simply fixed on water-cooling plate without any special package, and the temperature of the FBGs is about 40 °C at the maximum output power. Our research work confirms the reliability of visible femtosecond laser in fabrication of FBGs intended to be applied in high power fiber oscillators.

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“…In 2012, Xiao et al reported a monolithic fiber laser oscillator with an output power of 1 kW, which was based on ytterbium-doped fiber (YDF) with core/inner cladding diameters of 20/400 µm and pumped by 915 nm LDs [8]. In 2016, the researches in Fujikura Inc. reported a 2 kW single-mode monolithic fiber laser oscillator with a specially designed LMA ytterbium-doped fiber [10]. Then, Fujikura Inc. has successively realized 3 kW and 5 kW near diffraction limited monolithic fiber laser oscillators based on the specially designed YDF [13], [14].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of 5-kW High-Stability Monolithic Fiber Laser Oscillator With or Without External Feedback

Shi

et al. 2019

IEEE Photonics J.

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In this paper, we construct a high power monolithic fiber laser oscillator based on a commercial ytterbium-doped fiber with core/inner cladding diameter of 25/400 µm. The output performances of the fiber oscillator are experimentally investigated in the conditions of either with or without an external feedback. In the presence of external feedback, a very strong stimulated Raman scattering (SRS) (∼9 dB below the signal light) emerges at the output power of ∼3.56 kW, where the onset of the transverse mode instability (TMI) limits further power scaling. By large angle cleaving the signal arm of the forward combiner to avoid external feedback, the maximum output power of 5.07 kW is achieved with no sign of TMI. The Raman stokes light is ∼35 dB below the signal light and the M 2 factor is measured to be ∼1.6. To directly characterize its power stability and engineering capability, the fiber oscillator is tested for continuous 5-h operation at ∼5.07 kW with power fluctuation less than 0.42%. During the test process, the output power, spectrum, beam quality, and temporal signal perform excellent stability. The experimental results reveal that thresholds of SRS and TMI strongly depend on the external feedback in high power fiber oscillators.

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2 kW single-mode fiber laser with 20-m long delivery fiber and high SRS suppression

Cited by 29 publications

References 2 publications

Functional Fibers and Functional Fiber-Based Components for High-Power Lasers

Functional Fibers and Functional Fiber-Based Components for High-Power Lasers

Fabrication of Fiber Bragg Gratings by Visible Femtosecond Laser for Multi-kW Fiber Oscillator

Experimental Study of 5-kW High-Stability Monolithic Fiber Laser Oscillator With or Without External Feedback

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