High Power Laser Science and Engineering, Volume. 12, Issue 4, 04000e38(2024)
Design and optimization methods towards a 10 kW high beam quality fiber laser based on the counter tandem pumping scheme
Figures & Tables(9)
Fig. 1. Evolution of signal power, Raman Stokes power and SRS gain along the fiber in (a) co-pumping and (b) counter-pumping schemes.
Fig. 2. Experimental setup for investigating the impact of fiber length on the SRS threshold in co-pumping and counter-pumping amplifiers.
Fig. 3. Experimentally measured and calculated SRS threshold versus the decreased length of DF (blue) and YDF (red) in (a) co-pumping and (b) counter-pumping schemes.
Fig. 4. SRS threshold of 30/250 μm counter tandem-pumped amplifier versus YDF length. The DF length is set as 2 m in the calculation.
Fig. 5. Experimental setup of the 10 kW counter tandem-pumped amplifier.
Fig. 6. Laser output spectra with output DF length (point A to point B in Figure 5) of (a)
Fig. 7. (a) Output power and corresponding optical-to-optical efficiency under different pump powers. (b) Power fluctuations at 10,030 W. (c) Time trace and corresponding Fourier transform under the operation power of 10,030 W.
Fig. 8. (a) Beam quality
Table 1. Main parameters in the simulation.
View tableView in ArticleTable 1. Main parameters in the simulation.
Parameter Value Parameter Value ${d}_{\mathrm{core}}$ 25 μm ${g}_\mathrm{R}$ 0.98×10–13 m/W ${d}_{\mathrm{clad}}$ 250 μm $N$ 6.8×1025 m–3 $\mathrm{NA}_{\mathrm{core}}$ 0.065 ${\sigma}_\mathrm{a}^{1018}$ 9.44×10–26 m–2 ${L}_{\mathrm{YDF}}$ 50 m ${\sigma}_{\mathrm{e}}^{1018}$ 7.3×10–25 m–2 ${L}_{\mathrm{DF}}$ 10 m ${\sigma}_\mathrm{a}^{1080}$ 2.29×10–27 m–2 ${\lambda}_{\mathrm{p}}$ 1018 nm ${\sigma}_{\mathrm{e}}^{1080}$ 2.82×10–25 m–2 ${\lambda}_{\mathrm{s}}$ 1080 nm ${\sigma}_\mathrm{a}^{1135}$ 1.16×10–28 m–2 ${\lambda}_{\mathrm{R}}$ 1135 nm ${\sigma}_{\mathrm{e}}^{1135}$ 6.46×10–26 m–2
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Ruixian Li, Hanshuo Wu, Hu Xiao, Zilun Chen, Jinyong Leng, Liangjin Huang, Zhiyong Pan, Pu Zhou. Design and optimization methods towards a 10 kW high beam quality fiber laser based on the counter tandem pumping scheme[J]. High Power Laser Science and Engineering, 2024, 12(4): 04000e38
Paper Information
Category: Research Articles
Received: Jan. 27, 2024
Accepted: Apr. 17, 2024
Published Online: Sep. 5, 2024
The Author Email: Hu Xiao (xhwise@163.com), Pu Zhou (zhoupu203@163.com)
CSTR:32185.14.hpl.2024.21
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