Extremely low NA Yb doped preforms (&lt;0.03) fabricated by MCVD

Petit, Vincent; Tumminelli, R.; Minelly, J.D.; Khitrov, V. V.

doi:10.1117/12.2214546

Cited by 15 publications

(14 citation statements)

References 6 publications

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“…Vincent et al reported a 1.6 kW nearly diffractionlimited output generated in an ultra-low-NA SIF with a 52 µm core diameter and a core NA of 0.025 [53] . Besides, a 3 kW laser output without PD and MI was achieved based on a low-NA fiber with a core diameter of 35 µm [54] . Very recently, Beier et al presented a narrow linewidth singlemode fiber amplifier system up to 4.4 kW with single-mode beam quality achieved by lowering the NA of the fiber to ∼0.04 [55] .…”

Section: Single-mode Operationmentioning

confidence: 99%

Development and prospect of high-power doped fibers

Wang

Chen

2018

High Pow Laser Sci Eng

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Ytterbium-doped fibers have become the optimum gain media of high-power fiber lasers thanks to a simple energy structure, which strongly reduces the excited state absorption, and a low quantum defect and a high optic-optic conversion efficiency, which means the low thermal load. In this paper, we take a review of the current state of the art in terms of Yb 3+ doped fibers for high-power fiber lasers, including the development of the fabrication techniques. The research work to overcome the challenges for Yb 3+ doped fibers, which affect the stability of output power and beam quality, will be demonstrated. Direction of further research is presented and the goal is to look for a fiber design, to boost single fiber output power, stabilize the laser power and support robust single-mode operation.

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Section: Single-mode Operationmentioning

confidence: 99%

Development and prospect of high-power doped fibers

Wang

Chen

2018

High Pow Laser Sci Eng

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“…Transmission loss (dB/m) = 10 ∆L log 10 P short /P long (1) where P short and P long are the detected transmitted power through the fiber before and after the fiber is cut respectively, and ∆L is the length of the cut piece. The average transmission loss for each fiber was then obtained by linearly fitting the five measurement points and calculating its slope.…”

Section: Transmission Lossesmentioning

confidence: 99%

“…Optical fibers doped with ytterbium (Yb) ions have attracted increasing interest for the development of high-power laser systems for applications requiring bright and high power beams, such as materials processing, medicine and telecommunications [1][2][3][4][5][6]. In comparison with other rare-earth (RE) ions, Yb is the favored lasing ion for emission at around 1 µm due to its numerous advantages, such as a simple energy-level diagram with only two electronic multiplets ( 2 F 5/2 and 2 F 7/2 ), a long fluorescence lifetime which provides the benefit of energy storage, and broad absorption and emission bands [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Fabrication and Characteristics of Yb-Doped Silica Fibers Produced by the Sol-Gel Based Granulated Silica Method

Sayed

Pilz

Najafi

et al. 2018

Fibers

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Combining the sol-gel method for fiber material production with the granulated silica method for preform assembly results in a robust method that offers a high degree of freedom regarding both the composition and the geometry of the produced fiber. Using this method, two types of Yb-doped silica glass composition, that feature an excess in P concentration with respect to Al, have been prepared. The elemental distributions in a fiber core were analyzed by scanning transmission electron microscopy (STEM). The elemental mapping shows a similar localization of Al, P and Yb through the microstructure. In addition, the influence of the variation in the co-dopant concentration, with respect to Yb, on the fiber properties has been investigated. The results show an increase in the refractive index step and in the fiber’s transmission loss as the excess concentration of P increases. A significant contribution to the losses can be assigned to the existence of impurities such as iron, which was detected in our samples by mass spectrometer. Single exponential fluorescence decays with lifetimes of around 0.88 ms were measured for the two compositions. Finally, pumping at 976 nm a laser slope efficiency of 67% at 1031 nm was achieved for one of the fiber compositions.

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“…An alternative technology is using gas-phase doping in MCVD system, where large-size Yb 3+ -doped silica core with high homogeneity has been achieved. Petit et al [11] have successfully prepared an Yb 3+ /Al 3+ /F --co-doped silica preform for double-clad fibers using a proprietary rare-earth vapor delivery system coupled to a standard MCVD lathe and achieved a low numerical aperture (NA) of 0.025 ± 0.005. M. E. Likhachev et al [12][13][14] developed an Yb 3+ /Al 3+ /P 5+ -co-doped active tapered cladding fiber with a core diameter of 67 um and core flatness was good to get perfect Gaussian mode shape with M 2 < 1.15.…”

Section: Introductionmentioning

confidence: 99%

Manipulating refractive index, homogeneity and spectroscopy of Yb^3+-doped silica-core glass towards high-power large mode area photonic crystal fiber lasers

Wang¹,

Hu²,

Xu³

et al. 2017

Opt. Express

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Output power scaling of single mode large mode area (LMA) photonic crystal fiber (PCF) amplifiers urgently requires the low refractive index of Yb-doped silica glasses whilst maintaining high optical homogeneity. In this paper, we report on a promising alternative Yb/Al/F/P-co-doped silica core-glass (YAFP), which is prepared by modified sol-gel method developed by our group and highly suitable for fabricating high power LMA PCF amplifiers. By controlling the doping combinations of Al/F/P in Yb-doped silica glass,it not only ensures low refractive index (RI) but also maintains the excellent optical homogeneity and spectroscopic properties of Yb. The spectroscopic properties of Yb ions have not deteriorated by the co-doping of F and P in YAFP glass compared with that of Yb/Al co-doped silica glass. A large-size (⌀5 mm × 90 mm) YAFP silica-core glass rod with low average RI difference of 2.6 × 10 (with respect to pure silica glass), and low radial and axial RI fluctuations of ~2 × 10, was prepared. A LMA PCF with 50 µm core diameter was obtained by stack-capillary-draw techniques using YAFP core glass. Its core NA is 0.027. An average amplified power of 97 W peaking at 1030 nm and light-light efficiency of 54% are achieved from a 6.5 m long PCF in the pulse amplification laser experiment. Meanwhile, quasi-single-mode transmission is obtained with laser beam quality factor M of 1.4.

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Extremely low NA Yb doped preforms (<0.03) fabricated by MCVD

Cited by 15 publications

References 6 publications

Development and prospect of high-power doped fibers

Development and prospect of high-power doped fibers

Fabrication and Characteristics of Yb-Doped Silica Fibers Produced by the Sol-Gel Based Granulated Silica Method

Manipulating refractive index, homogeneity and spectroscopy of Yb^3+-doped silica-core glass towards high-power large mode area photonic crystal fiber lasers

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