DC Field | Value | Language |
---|---|---|
dc.contributor.advisor | Nam, Chang-Hee | - |
dc.contributor.advisor | 남창희 | - |
dc.contributor.author | Hong, Kyung-Han | - |
dc.contributor.author | 홍경한 | - |
dc.date.accessioned | 2011-12-14T07:23:18Z | - |
dc.date.available | 2011-12-14T07:23:18Z | - |
dc.date.issued | 2003 | - |
dc.identifier.uri | http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=180929&flag=dissertation | - |
dc.identifier.uri | http://hdl.handle.net/10203/47304 | - |
dc.description | 학위논문(박사) - 한국과학기술원 : 물리학과, 2003.2, [ [iv], 86 p. ] | - |
dc.description.abstract | Measurements and active control of the temporal characteristics of femtosecond laser pulses are investigated. The effect of quadratic, cubic and quartic phase terms on the temporal profile of frequency-chirped laser pulses is analyzed, and a new technique is developed for the characterization of femtosecond laser pulses by applying an evolutionary algorithm to an interferometric autocorrelation measurement. The absolute phase term is discussed as a parameter of temporal characteristics in the case of few-cycle pulses. Chirped femtosecond laser pulses, generated by adjusting the grating separation of a pulse compressor in a chirped-pulse amplification laser, are investigated in time, frequency, and time-frequency domains. The quadratic phase terms and the pulse duration are analyzed with respect to grating detuning, and the effect of the high-order phase terms on the pulse duration is also examined. A time-frequency analysis of chirped femtosecond pulses is performed using the Wigner distribution (WD) function. The chirp structure is graphically interpreted in the WD using a peak detection method, which resolves the multicomponent frequencies that cannot be seen in the standard Fourier analysis. A new technique to recover the temporal phase of a femtosecond laser pulse from its interferometric autocorrelation trace and laser spectrum is presented. The phase retrieval algorithm, called `Evolutionary Phase Retrieval from Interferometric Auto-Correlation (EPRIAC),` is optimized for the characterization of few-cycle optical pulses and is tested with numerically generated femtosecond pulses. In actual applications, a 29-fs negatively chirped pulse and a sub-10-fs pulse containing high-order phase distortion are successfully characterized. Adaptive compression of femtosecond laser pulses is demonstrated using a low-loss pulse shaper that employs a micro-machined deformable mirror and a Brewster-cut prism. Much enhanced transmission efficiency (more than 85 %) is achie... | eng |
dc.language | eng | - |
dc.publisher | 한국과학기술원 | - |
dc.subject | Evolutionary algorithm | - |
dc.subject | Wigner time-frequency distribution function | - |
dc.subject | chirped-pulse amplification | - |
dc.subject | femtosecond laser | - |
dc.subject | Absolute phase | - |
dc.subject | 절대 위상 | - |
dc.subject | 진화 알고리즘 | - |
dc.subject | 위그너 시간-주파수 분포 함수 | - |
dc.subject | 처프 펄스 증폭 | - |
dc.subject | 펨토초 레이저 | - |
dc.title | Measurements and active control of the temporal characteristics of femtosecond laser pulses | - |
dc.title.alternative | 펨토초 레이저 펄스의 시간특성 측정과 능동적 제어 | - |
dc.type | Thesis(Ph.D) | - |
dc.identifier.CNRN | 180929/325007 | - |
dc.description.department | 한국과학기술원 : 물리학과, | - |
dc.identifier.uid | 000985401 | - |
dc.contributor.localauthor | Hong, Kyung-Han | - |
dc.contributor.localauthor | 홍경한 | - |
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.