High Power Laser Science and Engineering, Volume. 9, Issue 4, 04000e58(2021)
Static and dynamic mode evolution in high-power distributed side-coupled cladding-pumped fiber amplifiers
Figures & Tables(19)
Fig. 2. (a) Power distribution and (b) fraction of the HOM in the DSCCP fiber amplifier.
Fig. 3. (a) Fraction of the HOM as a function of backward pump power ratio under different pump powers. (b) Normalized data of (a). (c) Fraction of the HOM as a function of the backward pump power ratio under different fiber lengths in the DSCCP fiber amplifier.
Fig. 4. (a) Fraction of the HOM and (b) normalized fraction of the HOM as a function of backward pump power ratio under different cladding sizes. (c) Fraction of the HOM and (d) normalized fraction of the HOM as a function of backward pump power ratio under different core sizes. (e) Fraction of the HOM and (f) normalized fraction of the HOM as a function of backward pump power ratio for 5 W seed power. (g) Fraction of the HOM and (h) normalized fraction of the HOM as a function of backward pump power ratio for
Fig. 5. (a) Fraction of HOM as a function of backward pump power ratio for different gain fibers; (b) normalized data of (a).
Fig. 6. (a) Fraction of the HOM as a function of backward pump power ratio for different dopant concentrations. (b) Normalized data of (a). (c) Fraction of the HOM as a function of backward pump power ratio for different dopant concentrations with
Fig. 7. The HOM fraction as a function of output signal power for the evenly bi-directional pumping case in Ref. [26].
Fig. 8. (a) Threshold signal power as a function of backward pump power fraction. (b) Threshold signal power as a function of seed power. (c) Threshold signal power as a function of total pump absorption. (d) Threshold signal power as a function of core diameter. (e) Threshold signal power as a function of cladding diameter. (f) Threshold signal power as a function of average coupling coefficient.
Fig. 9. (a) Threshold signal power as a function of backward pump power fraction for different cladding sizes. (b) Normalized threshold signal power as a function of backward pump power fraction for different cladding sizes. (c) Threshold signal power as a function of backward pump power fraction for different core sizes. (d) Normalized threshold signal power as a function of backward pump power fraction for different core sizes.
Fig. 10. (a) Threshold signal power as a function of fiber length for backward pump power fraction of 0 corresponding to the co-pumping scheme. (b) Backward pump power fraction of 0.5 corresponding to the bi-directional-pumping scheme. (c) Backward pump power fraction of 1 corresponding to the counter-pumping scheme. (d) Threshold signal power as a function of the backward pump power fraction.
Fig. 11. Threshold signal power as a function of coupling coefficient.
Fig. 12. (a) Threshold signal power as a function of fiber length for backward pump power fraction of 0.5. (b) Threshold signal power as a function of the backward pump power fraction for different fiber lengths. (c) Threshold signal power as a function of dopant concentration. (d) Threshold signal power as a function of the convection coefficient.
Fig. 13. Schematic diagram of DSCCP fiber with two without-contact inner claddings.
Fig. 14. (a) Threshold signal power and (b) normalized threshold signal power as a function of the backward pump power fraction for different pump cores.
Fig. 15. Schematic diagram of distributed side-coupled cladding-pumped fiber with two in-contact pump cores.
Fig. 16. Threshold signal power as a function of the backward pump power fraction.
Table 1. Parameters of the test amplifier.
View tableView in ArticleTable 1. Parameters of the test amplifier.
Physical Physical symbols Value References symbols Value References nclad 1.45 [ 51 ]RN(Ω) –100 dBc/Hz [ 8 ]NA 0.065 / ${\sigma}_{\mathrm{p}}^{\mathrm{a}}$ 2.18 × 10–24 m2 [ 8 ]Rc 15 μm / ${\sigma}_{\mathrm{p}}^{\mathrm{e}}$ 2.18 × 10–24 m2 [ 8 ]R 125 μm / ${\sigma}_{\mathrm{s}}^{\mathrm{a}}$ 7.22 × 10–27 m2 [ 8 ]λp 976 nm / ${\sigma}_{\mathrm{s}}^{\mathrm{e}}$ 4.34 × 10–25 m2 [ 8 ]λs 1064 nm / T 901 μs [ 51 ]hq 1000 W/(m2 K) [ 52 ]γ(r, ϕ, z) 0 / H 1.2 × 10–5 K−1 [ 51 ]P 20 W / κT 1.38 W/(K m) [ 51 ]ξ0 0.01 / ρC 1.54 × 106 J/(K m3) [ 51 ]
Table 2. Mode instability threshold of DSCCP fiber with two in-contact pump cores.
View tableView in ArticleTable 2. Mode instability threshold of DSCCP fiber with two in-contact pump cores.
Threshold signal power (W) k3 (m–1) 1.6 m 3 m 2.5 735 919 10 739 923 20 741 925
Table 3. Mode instability threshold of DSCCP fiber with two in-contact pump cores.
View tableView in ArticleTable 3. Mode instability threshold of DSCCP fiber with two in-contact pump cores.
Threshold signal power (W) Fraction of backward pump power 27.5 m 51.7 m 0 3200 3500 0.5 4430 5350 1 4800 5620
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Rumao Tao, Yu Liu, Lianghua Xie, Cong Gao, Min Li, Benjian Shen, Shan Huang, Honghuan Lin, Jianjun Wang, Feng Jing. Static and dynamic mode evolution in high-power distributed side-coupled cladding-pumped fiber amplifiers[J]. High Power Laser Science and Engineering, 2021, 9(4): 04000e58
Paper Information
Special Issue: HIGH ENERGY DENSITY PHYSICS AND HIGH POWER LASERS
Received: Jul. 9, 2021
Accepted: Sep. 24, 2021
Published Online: Nov. 17, 2021
The Author Email: Rumao Tao (supertaozhi@163.com)
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