Gain-tailored Yb/Ce codoped aluminosilicate fiber for laser stability improvement at high output power

Zhang, Fangfang; Wang, Yibo; Xi, Lin; Cheng, Yongshi; Zhang, Zhilun; Liu, Yehui; Liao, Lei; Xing, Yingbin; Liu, Yang; Dai, Nengli; Li, Haiqing; Li, Jinyan

doi:10.1364/oe.27.020824

Cited by 33 publications

(15 citation statements)

References 47 publications

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“…The TMI threshold of the co-pumping scheme is about 1598 W, which is about 2.23 times and 1.28 times as much as that of the conventional fiber and the confined-doped fiber with the core and inner cladding diameter of ~33 μm and 400 μm, respectively, experimentally reported in Ref. [20]. Firstly, the Gaussian gain dopant profile better matches the FM gain field, making FM easier to be dominant in transverse mode competition and enlarging the gain difference between FM and HOM [23].…”

Section: Resultsmentioning

confidence: 78%

“…The energy coupling between different modes on the time scale of millisecond will lead to a sudden degradation in beam quality [10][11][12][13][14]. The TMI threshold will be improved by reducing the core V value [15], increasing the inner cladding diameter [16], employing new fiber structures [17], and controlling the gain dopant distribution in fiber core [18][19][20], etc.…”

Section: Introductionmentioning

confidence: 99%

“…Citation information: DOI 10.1109/JPHOT.2021.3096716, IEEE Photonics Journal confined-doped fiber was utilized for a tandem-pump fiber amplifier, which realized 4 kW laser output with the beam quality M 2 factor of 1.59 [25]. Lately, a 33/400 μm confined-doped fiber was fabricated with Yb 3+ ions doping diameter ratio of 70%, and it was demonstrated that the TMI threshold of confined-doped fiber was about 1250 W which was 1.74 times that of conventional fiber [20].…”

Section: Introductionmentioning

confidence: 99%

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Gaussian-Shaped Gain-Dopant Distributed Fiber for High Output Power Fiber Amplifier

Zhang

Gui

et al. 2021

IEEE Photonics J.

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The remarkable evolution of ytterbium-doped fiber (YDF) lasers and amplifiers is interrupted by a limiting thermo-optical effect called transverse mode instability (TMI). Hereon, we propose a Gaussian-shaped gain-dopant distributed (GSGDD) YDF, which is fabricated by a modified chemical vapor deposition (MCVD) process combined with solution doping technique (SDT). By regulating the solution concentrations of soot layers, the content of Yb 3+ ions presents Gaussian-shaped distribution in the transverse direction while the refractive index profile (RIP) exhibits a stepped profile. The laser performance of this fiber is verified by a bidirectional pumped master oscillator power amplifier (MOPA). Over 3 kW near-single-mode laser output is obtained with the slope efficiency of 84.9%. At the highest power output, there are no Stokes light components in the spectrum and the beam quality M 2 factor is ~1.45These results suggest that the GSGDD fiber owns great potential to achieve high power output with excellent beam quality.

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Section: Resultsmentioning

confidence: 78%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Gaussian-Shaped Gain-Dopant Distributed Fiber for High Output Power Fiber Amplifier

Zhang

Gui

et al. 2021

IEEE Photonics J.

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“…So it is difficult to balance TMI and SRS at the same time. In order to realize the simultaneous suppression of TMI and SRS, substantial research work has been carried out, including designing the new fiber structure [9][10][11][12][13][14], optimizing the laser system parameters and structure [15][16][17][18], and so on. From the perspective of laser structure, high-power fiber lasers are mainly divided into two types: the fiber amplifiers based on master oscillation power amplification (MOPA) structure and the fiber laser oscillators based on Fabry-Perot (FP) cavity structure.…”

Section: Introductionmentioning

confidence: 99%

A 3.5-kW near-single-mode oscillating–amplifying integrated fiber laser

Zeng

Wang

Yang

et al. 2021

High Pow Laser Sci Eng

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The fiber laser based on oscillating-amplifying integrated structure has the potential to take into account the advantages of fiber laser oscillator and amplifier with the characteristics of strong anti-back reflected light ability and high efficiency. Here, we achieved a 3.5 kW near single-mode (M 2~1 .24) oscillating-amplifying integrated fiber laser with an active fiber length of 8 m in the oscillating section and 17.6 m in the amplifying section. While operating at the maximum power, the optical-to-optical conversion efficiency is 87.0%, and the intensity of stimulated Raman scattering is about 23.61 dB lower than the signal light. As far as we know, this is the highest output power of the oscillating-amplifying integrated fiber laser, accompanied with the best beam quality and the highest efficiency.

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“…[27] Using the same technique, Zhang et al achieved an M 2 of 1.47 using 70% confined core structure in a 33/395 μm Yb codoped with Ce to reduce the photodarkening (PD) effect. [28] However, it is challenging to fabricate a fiber with a customized doping profile with uniform dopant distribution in a repeatable manner. It requires precise control of fabrication conditions such as the deposition temperature, flow rate of different gases, and collapsing parameters during multiple steps to achieve the optimum profile.…”

Section: Introductionmentioning

confidence: 99%

Novel Dopant Tailored Fibers Using Vapor Phase Chelate Delivery Technique

Choudhury

Chowdhury

et al. 2021

Physica Status Solidi (a)

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The vapor phase chelate delivery (VPCD) technique in conjunction with the modified chemical vapor deposition (MCVD) process is adopted to fabricate fibers with customized doping profiles. The three large‐mode area (LMA) step‐index fibers with different rare‐earth doping profiles in the core region, such as uniform doping, centralized doping, and circumferential doping, are fabricated by optimizing the fabrication parameters. The fibers are tested in a cladding‐pumped amplifier configuration and their output beam qualities and signal‐to‐noise ratio (SNR) are characterized. The investigation reveals that the fiber with centralized doping in the core region exhibits lower M 2 compared with the fibers with uniform and circumferential doping, as it has a lower overlap of the higher‐order modes with the doped region. The experimental result is further affirmed through theoretically simulated results. The developed fabrication technique shows potential to fabricate specialty fibers of varied designs, where customized doping profiles are required.

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Gain-tailored Yb/Ce codoped aluminosilicate fiber for laser stability improvement at high output power

Cited by 33 publications

References 47 publications

Gaussian-Shaped Gain-Dopant Distributed Fiber for High Output Power Fiber Amplifier

Gaussian-Shaped Gain-Dopant Distributed Fiber for High Output Power Fiber Amplifier

A 3.5-kW near-single-mode oscillating–amplifying integrated fiber laser

Novel Dopant Tailored Fibers Using Vapor Phase Chelate Delivery Technique

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