The propagation dynamics and stability of an intense laser beam in a radial power-law plasma channel

Xueren HONG (洪学仁); Desheng ZHANG (张德生); Jiming GAO (高吉明); Rongan TANG (唐荣安); Peng GUO (郭鹏); Jukui XUE (薛具奎)

doi:10.1088/2058-6272/ac2ecf

Plasma Science and Technology > 2021 > 23(12): 125002. > DOI: 10.1088/2058-6272/ac2ecf

Xueren HONG (洪学仁), Desheng ZHANG (张德生), Jiming GAO (高吉明), Rongan TANG (唐荣安), Peng GUO (郭鹏), Jukui XUE (薛具奎). The propagation dynamics and stability of an intense laser beam in a radial power-law plasma channel[J]. Plasma Science and Technology, 2021, 23(12): 125002. DOI: 10.1088/2058-6272/ac2ecf

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The propagation dynamics and stability of an intense laser beam in a radial power-law plasma channel

¹ Key Laboratory of Atomic Molecular Physics & Functional Materials of Gansu Province, and College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, People's Republic of China
² School of Mathematics and Physics, Lanzhou Jiaotong University, Lanzhou 730070, People's Republic of China

Funds: This work is supported by National Natural Science Foundation of China (Nos. 11 765 017, 11 865 014, 12 047 574, 11 847 304, 11 764 039 and 12 165 018), and by the Scientific Research Project of Gansu Higher Education (No. 2019B-034).

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Received Date: June 01, 2021
Revised Date: September 30, 2021
Accepted Date: October 10, 2021

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Abstract

Abstract

By containing ponderomotive self-channeling, the propagation behavior of an intense laser beam and the physical conditions are obtained theoretically in a radial power-law plasma channel. It is found that ponderomotive self-channeling results in the emergence of a solitary wave and catastrophic focusing, which apparently decreases the region for stable propagation in a parameter space of laser power and the ratio of the initial laser spot radius to the channel radius (RLC). Direct numerical simulation confirms the theory of constant propagation, periodic defocusing and focusing oscillations in the parameter space, and reveals a radial instability which prevents the formation of bright and dark solitary waves. The corresponding unstable critical curve is added in the parameter space numerically and the induced unstable region above the unstable critical curve covers that of catastrophic focusing, which shrinks the stable region for laser beams. For the expected constant propagation, the results reveal the need for a low RLC. Further study illustrates that the channel power-law exponent has an obvious effect on the final stable region and laser propagation, for example increasing this exponent can enlarge the stable region significantly, which is beneficial for guiding of the laser and increases the lowest RLC for constant propagation. Our results also show that the initial laser amplitude has an apparent influence on the propagation behavior.
- laser beam,
- power-law channel,
- propagation dynamics,
- stability

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References (51)

References

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The propagation dynamics and stability of an intense laser beam in a radial power-law plasma channel