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," High Power Laser Sci. Eng. 12, 04000e38 (2024)
- High Power Laser Science and Engineering
- Vol. 12, Issue 4, 04000e38 (2024)
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) L = 6 m, (b) L = 4 m, (c) L = 2 m and (d) L = 1.5 m.
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 M 2 and beam profiles at the waist (insert) under different output powers. (b) Screenshot of the beam quality measurement software at the operation power of 10,030 W.
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Table 1. Main parameters in the simulation.
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