High Power Laser Science and Engineering, 2022, 10 (6): 06000e44, Published Online: Jan. 9, 2023   

Transverse mode instability mitigation in a high-power confined-doped fiber amplifier with good beam quality through seed laser control

Author Affiliations
College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha, China
Figures & Tables

Fig. 1. (a) Refractive index profile of the fiber across the core region; (b) cross-section photograph of the confined-doped fiber.

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Fig. 2. Experimental schematic of the confined-doped fiber amplifier (PSC, pump and signal combiner; YDF, ytterbium-doped fiber; CMS, cladding mode stripper).

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Fig. 3. (a) The output power and optical-to-optical efficiency as a function of the pump power; (b) the beam quality factor evolution as a function of the output power.

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Fig. 4. The TMI threshold and extracted power as a function of seed laser power.

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Fig. 5. The experimental schematic of the power controllable seed laser based on the bending loss mechanism.

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Fig. 6. The experimental schematic of the S2 measurement (TFL, tunable fiber laser; FUT, fiber under test; MO, microscope objective; CCD, charge-coupled device).

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Fig. 7. S2 measurement results when the bending diameter of the FUT is (a) 35 cm, (b) 20 cm, (c) 15 cm and (d) 8 cm.

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Fig. 8. Extracted power at different seed laser powers.

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Fig. 9. (a) TMI threshold and the power of the fundamental mode upon the onset of TMI and (b) the mode purity of the output laser as a function of the seed laser mode purity (simulation results).

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Fig. 10. The pump gain distribution of HOM-A along the fiber when the seed mode purities are 0.6 and 1.

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Fig. 11. (a) Output power as a function of the pump power; (b) output spectra at different output powers.

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Fig. 12. The beam quality factor evolution as a function of the output power.

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Table1. Bending diameter/length and the seed laser power at different bending states.

Bending stateABCDN
Bending diameter/m~0.15~0.09~0.08~0.06No bending
Bending length/m~1.0~1.0~0.75~0.5
Seed power/W1401109070180

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Table2. The main parameters of the fiber amplifier.

ParameterValueParameterValue
rcore20 μmrclad125 μm
λp1018 nmλs1080 nm
${\sigma}_{\mathrm{ap}}$ 9.44 × 10–26 m2 ${\sigma}_{\mathrm{ep}}$ 7.30 × 10–25 m2
${\sigma}_{\mathrm{as}}$ 2.29 × 10–27 m2 ${\sigma}_{\mathrm{es}}$ 2.82 × 10–25 m2
τ840 μsn4.94 × 1025 m-3
L36 m $\rho {C}_0$ $1.55\times {10}^6$ J/(m3·K)
${k}_\mathrm{T}$ $1.2\times {10}^{-5}$ $\kappa$ 1.38 W/K

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Hanshuo Wu, Haobo Li, Yi An, Ruixian Li, Xiao Chen, Hu Xiao, Liangjin Huang, Huan Yang, Zhiping Yan, Jinyong Leng, Zhiyong Pan, Pu Zhou. Transverse mode instability mitigation in a high-power confined-doped fiber amplifier with good beam quality through seed laser control[J]. High Power Laser Science and Engineering, 2022, 10(6): 06000e44.

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