#### Optimization of high-order harmonic generation in the space and time domains = 고차조화파 발생의 시공간상 최적화

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For strong harmonic generation an intense femtosecond laser pulse is applied to a high-density gas media. The ionization of gas medium during high-order harmonic generation cannot be avoided, therefore, it should be controlled in both the space and time domains in order to generate optimized high-order harmonics. In the time domain, ionization of the medium induces self-phase modulation(SPM), which affects the harmonic spectrum. By a precise control of the chirp of the incident laser pulse, the spectral broadening induced by SPM was properly removed at various laser intensities from $1 \times 10^{15}$ to $5 \times 10^{15} \, W/cm^2$. To verify SPM due to ionization, the temporal characteristics of laser pulses, after they pass through the ionizing medium, were measured using the method of the temporal analysis by dispersing a pair of light electric-fields. The measurements clearly showed the modification of laser pulses due to ionization of medium. In the space doma
Advisors
Nam, Chang-Heeresearcher남창희researcher
Description
한국과학기술원 : 물리학과,
Publisher
한국과학기술원
Issue Date
2004
Identifier
240480/325007  / 020015093
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 물리학과, 2004.8 , [ v, 89 p. ]

Keywords

EUV; FEMTOSECOND LASER; IONIZATION; HIGH-ORDER HARMONIC GENERATION; SOFT X-RAYON; 연엑스선격 이동이저; 극자외선; 펨토초 레이저; 이온화; 고차조화파

URI
http://hdl.handle.net/10203/47350
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=240480&flag=dissertation
Appears in Collection
PH-Theses_Ph.D.(박사논문)
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