Theoretical analysis of strong high-order harmonic generation using two-color femtosecond laser field = 이색 펨토초 레이저장을 이용한 강한 고차 조화파 발생의 이론적 분석

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We theoretically investigate the high-order harmonic generation (HHG) with an intense two-color femtosecond laser field, in which both fundamental field and its second harmonic are linearly polarized. In contrast to usual HHG with a linearly polarized fundamental field, the ionized electron moves in a plane and there enter new degrees of freedom: angle between polarization axes, relative phase, and relative intensities. The dependence on these parameters are investigated comprehensively with quantum mechanical simulation of HHG. Furthermore, by using the semiclassical model of HHG, this dependence is explained in terms of electron paths contributing to HHG. The symmetry of the interacting system is also analyzed that the possible orders depending on polarization and the π-periodic dependence on the relative phase are derived. Considering the present status of HHG as an ultrashort soft x-ray source, the utilization of the new degrees of freedom to generate attosecond pulses is investigated. With proper choice of the relative phase, short paths are found to be enhanced compared to case with the one-color field of the same intensity, and this results in strong and regular attosecond pulse train. By adjusting the polarization directions, the amount of ionization can be reduced, which is promising for better phase matching in macroscopic generation. The strong attosecond pulses obtained in this way can be useful for applications such as time-resolved studies of ultrafast phenomena in atoms and molecules.
Advisors
Nam, Chang-Heeresearcher남창희researcher
Description
한국과학기술원 : 물리학과,
Publisher
한국과학기술원
Issue Date
2006
Identifier
254166/325007  / 020005081
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 물리학과, 2006.2, [ xi, 84 p. ]

Keywords

High-order harmonic generation; two-color field; 이색파; 고차 조화파 발생

URI
http://hdl.handle.net/10203/47386
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=254166&flag=dissertation
Appears in Collection
PH-Theses_Ph.D.(박사논문)
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