Measurement of the matched spot size in a capillary discharge waveguide with a collimated laser

Jiaqi Liu, Wentao Li, Jiansheng Liu, Zhiyong Qin, Wentao Wang, Rong Qi, Zhijun Zhang, Changhai Yu, Ming Fang, Ke Feng, Ying Wu, Cheng Wang, Ruxin Li

Research output: Contribution to journalArticle

Abstract

Measurement of the matched spot size in the hydrogen-filled capillary discharge waveguide based on the spot size oscillation of a collimated laser is presented in this paper. The spot size oscillation trace is retrieved from the laser modes measured at the exits of discharged capillaries of different lengths under the same discharge conditions. With the gas pressure, peak discharge electric current and capillary radius fixed, the radial density profiles are identical in all the discharged capillaries. The measured laser modes are equivalent to the evolution at discrete positions in a long plasma channel. Compared to former researches based on the spot size at the capillary exit, this method is not affected by the multiple solution problem. The use of a collimated laser eliminates the influences of the divergence angle on the fitting accuracy. By this means, the matched spot sizes of hydrogen-filled capillary discharge waveguides under different gas pressures (5-20mbar) are measured. The results can provide a spot size reference for the laser wakefield accelerator guided in a plasma channel.

LanguageEnglish
Article number105204
Number of pages8
JournalAIP Advances
Volume8
Issue number10
DOIs
Publication statusPublished - 3 Oct 2018

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waveguides
lasers
laser modes
gas pressure
oscillations
hydrogen
electric current
divergence
accelerators
radii
profiles

Keywords

  • matched spot size
  • laser modes
  • discharged capillaries
  • hydrogen-filled capillary discharge

Cite this

Liu, Jiaqi ; Li, Wentao ; Liu, Jiansheng ; Qin, Zhiyong ; Wang, Wentao ; Qi, Rong ; Zhang, Zhijun ; Yu, Changhai ; Fang, Ming ; Feng, Ke ; Wu, Ying ; Wang, Cheng ; Li, Ruxin. / Measurement of the matched spot size in a capillary discharge waveguide with a collimated laser. In: AIP Advances. 2018 ; Vol. 8, No. 10.
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abstract = "Measurement of the matched spot size in the hydrogen-filled capillary discharge waveguide based on the spot size oscillation of a collimated laser is presented in this paper. The spot size oscillation trace is retrieved from the laser modes measured at the exits of discharged capillaries of different lengths under the same discharge conditions. With the gas pressure, peak discharge electric current and capillary radius fixed, the radial density profiles are identical in all the discharged capillaries. The measured laser modes are equivalent to the evolution at discrete positions in a long plasma channel. Compared to former researches based on the spot size at the capillary exit, this method is not affected by the multiple solution problem. The use of a collimated laser eliminates the influences of the divergence angle on the fitting accuracy. By this means, the matched spot sizes of hydrogen-filled capillary discharge waveguides under different gas pressures (5-20mbar) are measured. The results can provide a spot size reference for the laser wakefield accelerator guided in a plasma channel.",
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author = "Jiaqi Liu and Wentao Li and Jiansheng Liu and Zhiyong Qin and Wentao Wang and Rong Qi and Zhijun Zhang and Changhai Yu and Ming Fang and Ke Feng and Ying Wu and Cheng Wang and Ruxin Li",
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Liu, J, Li, W, Liu, J, Qin, Z, Wang, W, Qi, R, Zhang, Z, Yu, C, Fang, M, Feng, K, Wu, Y, Wang, C & Li, R 2018, 'Measurement of the matched spot size in a capillary discharge waveguide with a collimated laser' AIP Advances, vol. 8, no. 10, 105204. https://doi.org/10.1063/1.5022817

Measurement of the matched spot size in a capillary discharge waveguide with a collimated laser. / Liu, Jiaqi; Li, Wentao; Liu, Jiansheng; Qin, Zhiyong; Wang, Wentao; Qi, Rong; Zhang, Zhijun; Yu, Changhai; Fang, Ming; Feng, Ke; Wu, Ying; Wang, Cheng; Li, Ruxin.

In: AIP Advances, Vol. 8, No. 10, 105204, 03.10.2018.

Research output: Contribution to journalArticle

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AU - Liu, Jiaqi

AU - Li, Wentao

AU - Liu, Jiansheng

AU - Qin, Zhiyong

AU - Wang, Wentao

AU - Qi, Rong

AU - Zhang, Zhijun

AU - Yu, Changhai

AU - Fang, Ming

AU - Feng, Ke

AU - Wu, Ying

AU - Wang, Cheng

AU - Li, Ruxin

PY - 2018/10/3

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N2 - Measurement of the matched spot size in the hydrogen-filled capillary discharge waveguide based on the spot size oscillation of a collimated laser is presented in this paper. The spot size oscillation trace is retrieved from the laser modes measured at the exits of discharged capillaries of different lengths under the same discharge conditions. With the gas pressure, peak discharge electric current and capillary radius fixed, the radial density profiles are identical in all the discharged capillaries. The measured laser modes are equivalent to the evolution at discrete positions in a long plasma channel. Compared to former researches based on the spot size at the capillary exit, this method is not affected by the multiple solution problem. The use of a collimated laser eliminates the influences of the divergence angle on the fitting accuracy. By this means, the matched spot sizes of hydrogen-filled capillary discharge waveguides under different gas pressures (5-20mbar) are measured. The results can provide a spot size reference for the laser wakefield accelerator guided in a plasma channel.

AB - Measurement of the matched spot size in the hydrogen-filled capillary discharge waveguide based on the spot size oscillation of a collimated laser is presented in this paper. The spot size oscillation trace is retrieved from the laser modes measured at the exits of discharged capillaries of different lengths under the same discharge conditions. With the gas pressure, peak discharge electric current and capillary radius fixed, the radial density profiles are identical in all the discharged capillaries. The measured laser modes are equivalent to the evolution at discrete positions in a long plasma channel. Compared to former researches based on the spot size at the capillary exit, this method is not affected by the multiple solution problem. The use of a collimated laser eliminates the influences of the divergence angle on the fitting accuracy. By this means, the matched spot sizes of hydrogen-filled capillary discharge waveguides under different gas pressures (5-20mbar) are measured. The results can provide a spot size reference for the laser wakefield accelerator guided in a plasma channel.

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