High power monolithic tapered ytterbium-doped fiber laser oscillator

Yang, Baolai; Zhang, Hanwei; Shi, Chen; Wang, Xiaolin; Pan, Zhiyong; Wang, Zefeng; Zhang, Pu; Xu, Xiaojun

doi:10.1364/oe.27.007585

Cited by 45 publications

(22 citation statements)

References 22 publications

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“…Compared with the active tapered all-fiber laser oscillator in Ref. [29], which shares a close equivalent core diameter of~25 µm, the fiber oscillator based on the CCTC fiber (equivalent core diameter of 27.3 µm) has a higher output power and TMI threshold under our experimental conditions.…”

Section: Resultsmentioning

confidence: 80%

“…The constant cladding can make the uniformity and concentricity of the fiber coating much easier to control in the fabrication process. Compared with a traditional tapered fiber (in which the core and cladding vary simultaneously along the fiber) [29,30] , the constant cladding diameter of the CCTC fiber means a varying core-cladding ratio, which has a smoother thermal load profile along the fiber. In addition, the large core section provides a large mode area to suppress the SRS effect.…”

Section: Resultsmentioning

confidence: 99%

“…However, most of the reported tapered fiber lasers have been constructed based on a spatial optics configuration, which lacks stability and compactness [23][24][25][26][27][28] . In 2019, our research group conducted an experimental investigation into all-fiberized laser oscillators and amplifiers based on long tapered fibers [29,30] . However, because of the larger core size at the output end, the M 2 factor of the output laser was greater than 2.0, indicating a high number of HOMs in the output.…”

Section: Introductionmentioning

confidence: 99%

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Novel constant-cladding tapered-core ytterbium-doped fiber for high-power fiber laser oscillator

et al. 2021

High Pow Laser Sci Eng

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Power scaling based on traditional ytterbium-doped fibers (YDFs) is limited by optical nonlinear effects and transverse mode instability (TMI) in high-power fiber lasers. Here, we propose a novel long tapered fiber with a constant cladding and tapered core (CCTC) along its axis direction. The tapered-core region of the fiber is designed to enhance the stimulated Raman scattering (SRS) threshold and suppress higher-order mode resonance in the laser cavity. The CCTC YDF was fabricated successfully with a modified chemical vapor deposition (MCVD) method combined with solution doping technology, which has a cladding diameter of 400 μm and a varying core with a diameter of ~24 μm at both ends and ~31 μm in the middle. To test the performance of the CCTC fiber during high-power operation, an all-fiber laser oscillator based on a CCTC YDF was investigated experimentally. As a result, a maximum output power of 3.42 kW was achieved with an optical-to-optical efficiency of 55.2%, although the TMI effect was observed at an output power of ~3.12 kW. The measured beam quality (M2 factor) was ~1.7, and no sign of the Raman component was observed in the spectrum. We believe that CCTC YDF has great potential to simultaneously mitigate the SRS and TMI effects, and further power scaling is promising by optimizing the structure of the YDF.

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Section: Resultsmentioning

confidence: 80%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Novel constant-cladding tapered-core ytterbium-doped fiber for high-power fiber laser oscillator

et al. 2021

High Pow Laser Sci Eng

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“…In 2018, a birefringent Yb-doped tapered fiber was demonstrated for linearly polarized CW and pulsed high-power amplifiers. [23] In 2019, the double cladding tapered Yb-doped fiber was used in a high-power monolithic fiber laser oscillator, which obtained the maximum average power of 1720 W when employing 975 nm pump source, [24] but the TMI effect occurred at the output power of 1350 W when employing 915 nm pump.…”

Section: Introductionmentioning

confidence: 99%

Amplification characteristics in active tapered segmented cladding fiber with large mode area

Xie

Ning

Jiao

et al. 2021

High Pow Laser Sci Eng

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A kind of tapered segmented cladding fiber (T-SCF) with large mode area (LMA) is proposed, and the mode and amplification characteristics of T-SCFs with concave, linear, and convex tapered structures are investigated based on finite-element method (FEM) and few-mode steady-state rate equation. Simulation results indicate that the concave tapered structure can introduce high loss for high-order modes (HOMs) that is advantageous to achieve single-mode operation, whereas the convex tapered structure provides large effective mode area that can help to mitigate nonlinear effects. Meanwhile, the small-to-large amplification scheme shows further advantages on stripping off HOMs, and the large-to-small amplification scheme decreases the heat load density induced by the high-power pump. Moreover, single-mode propagation performance, effective mode area, and heat load density of the T-SCF are superior to those of tapered step index fiber (T-SIF). These theoretical model and numerical results can provide instructive suggestions for designing high-power fiber lasers and amplifiers.

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“…B. Yang et al have constructed a monolithic tapered ytterbium-doped fiber laser oscillator and investigated the laser oscillator performance with respect to 976 nm and 915 nm pump, especially on the aspects of the TMI. They report the highest average power for the tapered ytterbium-doped fiber lasers [11]. N. Dalloz et al conceived a bidirectional 793 nm diode-pumped actively Q-switched Tm 3+ , Ho 3+ -codoped silica polarization-maintaining (PM) double-clad (DC) fiber laser.…”

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confidence: 99%

Advanced Solid-State Lasers 2019: focus issue introduction

Sennaroğlu¹,

Goodno²,

Mirov³

et al. 2020

Opt. Mater. Express

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This joint issue of Optics Express and Optical Materials Express features 28 state-ofthe-art articles written by authors who participated in the international "Advanced Solid State Lasers" conference, held in Boston November 4-8, 2018. This review provides a summary of these articles that cover the spectrum of solid state lasers from materials research to sources and from design innovation to applications.

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High power monolithic tapered ytterbium-doped fiber laser oscillator

Cited by 45 publications

References 22 publications

Novel constant-cladding tapered-core ytterbium-doped fiber for high-power fiber laser oscillator

Novel constant-cladding tapered-core ytterbium-doped fiber for high-power fiber laser oscillator

Amplification characteristics in active tapered segmented cladding fiber with large mode area

Advanced Solid-State Lasers 2019: focus issue introduction

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