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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Main Authors: Yu-hsin Chen, 陳聿昕
Other Authors: Jyhpyng Wang
Format: Others
Language:zh-TW
Published: 2002
Online Access:http://ndltd.ncl.edu.tw/handle/55222634875800734045
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spelling 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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language zh-TW
format Others
sources NDLTD
description 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.
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
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