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Investigations of mode-locked Er-doped oscillators with record high-pulse energies

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Abstract

In our experiment, based on nonlinear polarization rotation (NPR), first, we demonstrate a large-energy square-wave mode-locked fiber laser under low pump power. The largest pulse energy of the square-wave pulses was 106.91 nJ. However, pulse breaking occurred when the pump power was higher than 1152 mW. Thus, under the maximum pump power of 2318 mW, several kinds of large-energy mode-locked operations were also investigated successfully. The maximum output pulse energy was recorded to be 881.34 nJ, which exhibits obvious enhancement in comparison with previous works. Additionally, in our work, we have successfully revealed that broadening of the pulse width, splitting of the pulse shape and increasing of the pulse repetition rate play significant roles in reducing the influence of large pulse energy and high peak power experimentally. Our experiment result will provide a useful guide for demonstrating large-energy pulse operations.

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Acknowledgements

This work was supported in part by the National Natural Science Foundation of China (Grant Nos. 61971271, 11904213, 11747149), Shandong Province Natural Science Foundation (ZR2018QF006), the Taishan Scholars Project of Shandong Province (Tsqn20161023), Primary Research and Development Plan of Shandong Province (2018GGX101018) and supported by “Opening Foundation of Shandong Provincial Key Laboratory of Laser Technology and Application”.

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Correspondence to Huanian Zhang or Dengwang Li.

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Zhao, R., Wang, M., Zheng, Y. et al. Investigations of mode-locked Er-doped oscillators with record high-pulse energies. Appl. Phys. B 126, 30 (2020). https://doi.org/10.1007/s00340-020-7381-y

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