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15 W monolithic fiber laser at 3.55 µm

Maxime Lemieux-Tanguay, Vincent Fortin, Tommy Boilard, Pascal Paradis, Frédéric Maes, Lauris Talbot, Réal Vallée, and Martin Bernier

Open Access Open Access

Abstract

We report a dual-wavelength-pumped all-fiber continuous-wave (CW) laser operating at 3.55 µm that reached an output power of 14.9 W, which is, to the best of our knowledge, a record. The laser cavity, made of an erbium-doped fluoride fiber and bounded by two fiber Bragg gratings (FBGs), operates at an overall optical efficiency of 17.2% and a slope efficiency of 51.3% with respect to the 1976 nm launched pump power. The all-fiber design of the cavity not only allows for significant power scaling of the laser output, but also improves its long-term stability at high output power. The cavity design was set according to a numerical optimization that showed very good agreement with the experimental results.

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Data availability

Data underlying the results presented in this Letter are not publicly available at this time but may be obtained from the authors upon reasonable request.

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Figures (6)
Fig. 1.
Fig. 1. Optimization map of the 3.55 µm output power as a function of both the length of the 1 mol. % Er3+:ZrF4 gain fiber and the reflectivity of the low-reflectivity (LR) output coupler with launched P1 (980 nm) and P2 (1976 nm) pump powers of 50 W and 35 W, respectively, and a high-reflectivity (HR) input coupler of 90% reflectivity.

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Fig. 2.
Fig. 2. (a) Experimental setup of the 3.55 µm Er3+:ZrF4 DWP all-fiber laser system. (b) ZrF4/SiO2 fiber splice with a core-to-core transmission of 75% at 1976 nm.

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Fig. 3.
Fig. 3. Laser spectra obtained at output powers of 1.7 and 14.9 W superposed on the transmission spectra of the HR-FBG and LR-FBG.

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Fig. 4.
Fig. 4. Output power at 3.55 µm as a function of the launched P2 power for five different launched P1 powers. Results of numerical modeling are represented by solid curves.

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Fig. 5.
Fig. 5. Residual P2 power as a function of the launched P2 power for five different launched P1 powers. Results of numerical modeling are represented by solid curves.

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Fig. 6.
Fig. 6. Stability test of the 3.55 μm output power over 90 min.

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