| PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES |
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Multibeam Raman amplification of a finite-duration seed in a short distance |
| Y G Chen(陈雨谷)1, Y Chen(陈勇)1, S X Xie(谢善秀)1, N Peng(彭娜)1, J Q Yu(余金清)1, and C Z Xiao(肖成卓)1,2,† |
1 Key Laboratory for Micro-/Nano-Optoelectronic Devices of Ministry of Education, School of Physics and Electronics, Hunan University, Changsha 410082, China;
2 Collaborative Innovation Center of IFSA(CICIFSA), Shanghai Jiao Tong University, Shanghai 200240, China |
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Abstract A new scheme of multibeam Raman amplification (MRA) is proposed in virtue of the collective mode by sharing a common scattered light. Multiple laser beams can provide a higher growth rate, but the overlapping region limits the amplification length. We suggest to use a finite-duration seed to facilitate MRA in a short distance. Through two-dimensional particle-in-cell simulations, we find that two-beam Raman amplification has a much higher growth rate than that of single-beam one. This growth rate depends on the initial seed amplitude, electron temperature, and seed duration. An empirical criterion, γ0τc=1, where γ0 is the theoretical growth rate of MRA, is used to choose a proper duration for a higher growth rate. After a total amplification length of 320 μm, the two-beam Raman amplification shows nonlinear features of pulse compression and a bow-shape wave front, indicating that the amplification has finally entered the self-similar regime.
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Received: 20 April 2021
Revised: 22 May 2021
Accepted manuscript online: 26 May 2021
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PACS:
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52.38.-r
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(Laser-plasma interactions)
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52.65.-y
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(Plasma simulation)
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| Fund: Project supported by the Strategic Priority Research Program of Chinese Academy of Sciences (Grant No. XDA25050700), the National Natural Science Foundation of China (Grant No. 11805062), Science Challenge Project (Grant No. TZ2016005), and Natural Science Foundation of Hunan Province, China (Grant Nos. 2020JJ5029 and 2020JJ5031), and the Project of Science and Technology on Plasma Physics Laboratory (Grant No. 6142A04190111). |
Corresponding Authors:
C Z Xiao
E-mail: xiaocz@hnu.edu.cn
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Cite this article:
Y G Chen(陈雨谷), Y Chen(陈勇), S X Xie(谢善秀), N Peng(彭娜), J Q Yu(余金清), and C Z Xiao(肖成卓) Multibeam Raman amplification of a finite-duration seed in a short distance 2021 Chin. Phys. B 30 105202
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