Time-Resolved Measurement of Laser-Plasma Interaction
碩士 === 國立臺灣大學 === 光電工程學研究所 === 90 === With the chirped pulse amplification technique invented in the 1980's, ultrashort laser pulses can be produced with multi-terawatt peak power and 10^19 W/cm^2 focused intensity in a university laboratory. When the laser pulses with such extremely...
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ndltd-TW-090NTU001240172015-10-13T14:38:05Z http://ndltd.ncl.edu.tw/handle/55222634875800734045 Time-Resolved Measurement of Laser-Plasma Interaction 雷射電漿交互作用之時間解析量測 Yu-hsin Chen 陳聿昕 碩士 國立臺灣大學 光電工程學研究所 90 With the chirped pulse amplification technique invented in the 1980's, ultrashort laser pulses can be produced with multi-terawatt peak power and 10^19 W/cm^2 focused intensity in a university laboratory. When the laser pulses with such extremely high intensity propagate in the plasma, many interesting phenomena will occur, such as stimulated Raman scattering, relativistic self-guiding, electron plasma wave and electron acceleration. There are two main parts in this thesis. First of all I introduce the 10-terawatt femtosecond laser system built by our group. The optical diagnosis systems and the output characteristics are illustrated. The temporal contrast issue, including measurement and optimization, is discussed in detail since it is very crucial for laser-plasma interaction experiments. In the second part I present our experiment results in laser-plasma interaction. They are preliminary works in our laser-plasma-based electron accelerator project. We characterized plasma generation and density distribution using time-resolved shearing interferometry. A stable self-guiding channel over multiple Rayleigh range is obtained in the plasma, and the channel length is increased with the increase of pulse duration. We also examine the dependence of Raman forward scattering with pulse duration and chirp and found that a positively chirped pulse enhances the Raman signal, while a negatively chirped one suppresses it. Collective Thomson scattering is used to resolve the temporal evolution of plasma wave driven by Raman forward scattering. A plasma wave lasting for 1 ps with maximum amplitude exceeding 2% is observed. Jyhpyng Wang 汪治平 2002 學位論文 ; thesis 99 zh-TW |
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碩士 === 國立臺灣大學 === 光電工程學研究所 === 90 === With the chirped pulse amplification technique invented in the 1980's, ultrashort laser pulses can be produced with multi-terawatt peak power and 10^19 W/cm^2 focused intensity in a university laboratory. When the laser pulses with such extremely high intensity propagate in the plasma, many interesting phenomena will occur, such as stimulated Raman scattering, relativistic self-guiding, electron plasma wave and electron acceleration.
There are two main parts in this thesis. First of all I introduce the 10-terawatt femtosecond laser system built by our group. The optical diagnosis systems and the output characteristics are illustrated. The temporal contrast issue, including measurement and optimization, is discussed in detail since it is very crucial for laser-plasma interaction experiments.
In the second part I present our experiment results in laser-plasma interaction. They are preliminary works in our laser-plasma-based electron accelerator project. We characterized plasma generation and density distribution using time-resolved shearing interferometry. A stable self-guiding channel over multiple Rayleigh range is obtained in the plasma, and the channel length is increased with the increase of pulse duration. We also examine the dependence of Raman forward scattering with pulse duration and chirp and found that
a positively chirped pulse enhances the Raman signal, while a negatively chirped one suppresses it. Collective Thomson scattering is used to resolve the temporal evolution of plasma wave driven by Raman forward scattering. A plasma wave lasting for 1 ps with maximum amplitude exceeding 2% is observed.
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author2 |
Jyhpyng Wang |
author_facet |
Jyhpyng Wang Yu-hsin Chen 陳聿昕 |
author |
Yu-hsin Chen 陳聿昕 |
spellingShingle |
Yu-hsin Chen 陳聿昕 Time-Resolved Measurement of Laser-Plasma Interaction |
author_sort |
Yu-hsin Chen |
title |
Time-Resolved Measurement of Laser-Plasma Interaction |
title_short |
Time-Resolved Measurement of Laser-Plasma Interaction |
title_full |
Time-Resolved Measurement of Laser-Plasma Interaction |
title_fullStr |
Time-Resolved Measurement of Laser-Plasma Interaction |
title_full_unstemmed |
Time-Resolved Measurement of Laser-Plasma Interaction |
title_sort |
time-resolved measurement of laser-plasma interaction |
publishDate |
2002 |
url |
http://ndltd.ncl.edu.tw/handle/55222634875800734045 |
work_keys_str_mv |
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