Low numerical aperature large-mode-area neodymium-doped fibers fabricated by SPCVD and ASD for laser operation near 920nm

Barnini, Alexandre; Corre, Kilian Le; Kervella, Louanne; Robin, Thierry; Guitton, Pascal; Laroche, Mathieu; Girard, Sylvain

doi:10.1117/12.2545917

Cited by 2 publications

(3 citation statements)

References 8 publications

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“…The introduction of AlPO 4 units in silica is famous for allowing the refractive index reduction in the rare-earth-doped core [17], so the pedestal could be suppressed. Moreover this material reduces notably the clustering of rare-earth ions and allows higher laser efficiency, as already demonstrated with other rare-earths such as erbium [18], [19], ytterbium [20], or neodymium [21]. Finally, the multiphonon absorption in the fiber core may also be reduced in the AlPO 4 codoped silica [22].…”

Section: Perspectivesmentioning

confidence: 70%

“…This sensitivity of the beam quality to the fiber coiling or position may be due to the uneven index profile of the fiber core. Ongoing work consists in fabricating a core host matrix based on a co-doping of aluminum and phosphorus, to test an approach that already showed interesting results with other rare-earths such as erbium [13], [14], ytterbium [15], or neodymium [16]. Indeed, this type of host offers low molar refractivity composition, and the possibility to reduce the refractive index of the rare-earth-doped core, which could eventually allow the suppression of the pedestal.…”

Section: Refractive Index Profile and Beam Qualitymentioning

confidence: 99%

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High efficiency holmium-doped triple-clad fiber laser at 2120 nm

Beaumont

Bourdon

Barnini

et al. 2022

J. Lightwave Technol.

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We developed a new holmium-doped triple-clad fiber (Ho-3CF), reducing the clad diameter to improve the overlap between pump and doped-core, and the holmium concentration to reduce the influence of ion clustering on the laser efficiency. We illustrate here the performance of this fiber in a laser oscillator configuration. The laser emission is centered at 2.12 µm by a fiber Bragg grating, and the active fiber is pumped in the clad by a 1.94 µm thulium-doped fiber laser. The slope efficiency reaches 60 %, for a maximum signal power of 62 W delivered on a quasi single spatial mode (M 2 =1.2). To the best of our knowledge, this slope efficiency is the highest reported for a high power clad-pumped fiber laser emitting at a wavelength higher than 2.1 µm. We also analyze experimentally the impact of the pump Numerical Aperture (NA), at the input of the Ho-3CF, on the laser efficiency. Finally, we use our numerical simulation to comment on the best choice of pump wavelength.

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Section: Perspectivesmentioning

confidence: 70%

Section: Refractive Index Profile and Beam Qualitymentioning

confidence: 99%

High efficiency holmium-doped triple-clad fiber laser at 2120 nm

Beaumont

Bourdon

Barnini

et al. 2022

J. Lightwave Technol.

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show abstract

“…Another approach, to simplify the fabrication, consists of a core composition that does not increase the refractive index. As it has been demonstrated with other rare-earth doping, such as Nd or Er [7][8][9] alumino-phospho-silicate (AlPO4) core composition, with almost identical concentration of phosphorous and aluminum, can offer this feature 10 .…”

Section: Introductionmentioning

confidence: 98%

High efficiency of a holmium doped fibre laser in clad-pump configuration

Beaumont¹,

Bourdon²,

Barnini³

et al. 2023

Fiber Lasers XX: Technology and Systems

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We recently developed a holmium-doped triple-clad fiber (Ho-3CF) for laser emission beyond 2.1 μm. In a clad-pumped fiber laser oscillator emitting at 2.12 μm, we obtained an optical efficiency of 73% with respect to the absorbed pump power at 1.94 μm, and a maximum signal power of 62 W. We present here the comparison between the laser measurements and a numerical simulation, together with the measurements of the required physical parameters (crosssections, attenuations…). The alumino-silicate core composition of our initial Ho-3CF samples required the introduction of a pedestal to preserve the single spatial-mode guiding. We also present our preliminary results on a new aluminophospho-silicate core composition, in order to suppress the initial pedestal and simplify the fabrication process. Both samples were also analyzed in core-pumped laser configuration.

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Low numerical aperature large-mode-area neodymium-doped fibers fabricated by SPCVD and ASD for laser operation near 920nm

Cited by 2 publications

References 8 publications

High efficiency holmium-doped triple-clad fiber laser at 2120 nm

High efficiency holmium-doped triple-clad fiber laser at 2120 nm

High efficiency of a holmium doped fibre laser in clad-pump configuration

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