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Nonlinear optics and electron genera...

Chen, Shouyuan.

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Nonlinear optics and electron generation in the interaction of a high intensity laser with underdense plasma.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Nonlinear optics and electron generation in the interaction of a high intensity laser with underdense plasma./
作者:	Chen, Shouyuan.
面頁冊數:	133 p.
附註:	Source: Dissertation Abstracts International, Volume: 66-02, Section: B, page: 0963.
Contained By:	Dissertation Abstracts International66-02B.
標題:	Physics, Fluid and Plasma. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3163768
ISBN:	0496980459

Nonlinear optics and electron generation in the interaction of a high intensity laser with underdense plasma.
Chen, Shouyuan.

Nonlinear optics and electron generation in the interaction of a high intensity laser with underdense plasma. - 133 p.

Source: Dissertation Abstracts International, Volume: 66-02, Section: B, page: 0963.

Thesis (Ph.D.)--University of Michigan, 2005.

This thesis presents a systematic study of the nonlinear optics and electron generation of a high power (up to 10 TW), ultrashort, (400 fs) laser pulse in an underdense plasma, which is formed by the photo-ionization of a helium gas target generated by a supsonic gas jet. The scattered light from the interaction region was measured spectrally and spatially from various directions as a function of laser intensity and plasma density, and correlated with the accelerated electron beam. The data shows that forward stimulated Raman scattering (SRS) is sensitive to the laser focal position relative to the nozzle. Together with spectrally resolved top-view images of the channel, the measurements indicate that SRS is seeded by the ionization front. This observation provides a method to control the Raman instability in laser-plasma interaction by controlling the ionization process. With the increase of the laser power, a novel nonlinear optical phenomenon, relativistic cross-phase modulation, is observed. The bandwidth of a Raman satellite is found to be broadened from 3.8 nm to 100 nm when the pump laser power is increased from 0.45 TW to 2.4 TW, corresponding to an intensity increase from I = 2.7 x 1017 Wcm-2 to 1.3 x 1018 Wcm -2. A signature of relativistic cross-phase modulation, namely, asymmetric spectral broadening of the Raman signal, is observed at a pump power of 2.4 TW (I = 1.3 x 1018 Wcm -2). The experimental cross-phase modulated spectra compared well with theoretical calculations. Relativistic cross phase modulation will be useful for the generation of high-power attosecond light pulses.

ISBN: 0496980459Subjects--Topical Terms:

1018402
Physics, Fluid and Plasma.

Nonlinear optics and electron generation in the interaction of a high intensity laser with underdense plasma.
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245 1 0 $a Nonlinear optics and electron generation in the interaction of a high intensity laser with underdense plasma.
300 $a 133 p.
500 $a Source: Dissertation Abstracts International, Volume: 66-02, Section: B, page: 0963.
500 $a Co-Chairs: Donald P. Umstadter; Georg Raithel.
502 $a Thesis (Ph.D.)--University of Michigan, 2005.
520 $a This thesis presents a systematic study of the nonlinear optics and electron generation of a high power (up to 10 TW), ultrashort, (400 fs) laser pulse in an underdense plasma, which is formed by the photo-ionization of a helium gas target generated by a supsonic gas jet. The scattered light from the interaction region was measured spectrally and spatially from various directions as a function of laser intensity and plasma density, and correlated with the accelerated electron beam. The data shows that forward stimulated Raman scattering (SRS) is sensitive to the laser focal position relative to the nozzle. Together with spectrally resolved top-view images of the channel, the measurements indicate that SRS is seeded by the ionization front. This observation provides a method to control the Raman instability in laser-plasma interaction by controlling the ionization process. With the increase of the laser power, a novel nonlinear optical phenomenon, relativistic cross-phase modulation, is observed. The bandwidth of a Raman satellite is found to be broadened from 3.8 nm to 100 nm when the pump laser power is increased from 0.45 TW to 2.4 TW, corresponding to an intensity increase from I = 2.7 x 1017 Wcm-2 to 1.3 x 1018 Wcm -2. A signature of relativistic cross-phase modulation, namely, asymmetric spectral broadening of the Raman signal, is observed at a pump power of 2.4 TW (I = 1.3 x 1018 Wcm -2). The experimental cross-phase modulated spectra compared well with theoretical calculations. Relativistic cross phase modulation will be useful for the generation of high-power attosecond light pulses.
520 $a A proof-of-principle experiment of laser injection laser acceleration (LILAC) concept also has been done by overlapping terawatt-power 400-femtosecond (taulaser &Gt; tauplasma) laser pulses (≤2.4 x 1018 W/cm2) in plasma. The interference pattern creates the first optical trap capable of confining relativistic electrons, with kinetic energy ≤350 keV. Experiment, numerical simulation and analysis all indicate that the electron density becomes deeply modulated, reaching peak values of up to ten times the background density (ne/n 0 &sim; 10), creating a DC electrostatic field on the order of 1011 eV/m. These values are to our knowledge the largest ever measured in the laboratory. Significant energy transfer (&sim;50%) between the two laser beams is also observed in both simulation and experiment. Applications to table-top size electron accelerators and x-ray sources are discussed.
590 $a School code: 0127.
650 4 $a Physics, Fluid and Plasma. $3 1018402
650 4 $a Physics, Optics. $3 1018756
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