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Pré-Publication, Document De Travail Année : 2022

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

Résumé

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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Dates et versions

hal-03716354 , version 1 (07-07-2022)

Identifiants

  • HAL Id : hal-03716354 , version 1

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Bastien Beaumont, Pierre Bourdon, Alexandre Barnini, Louanne Kervella, Thierry Robin, et al.. High efficiency holmium-doped triple-clad fiber laser at 2120 nm. 2022. ⟨hal-03716354⟩
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