Measurements and active control of the temporal characteristics of femtosecond laser pulses = 펨토초 레이저 펄스의 시간특성 측정과 능동적 제어

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dc.contributor.advisorNam, Chang-Hee-
dc.contributor.authorHong, Kyung-Han-
dc.description학위논문(박사) - 한국과학기술원 : 물리학과, 2003.2, [ [iv], 86 p. ]-
dc.description.abstractMeasurements 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.subjectEvolutionary algorithm-
dc.subjectWigner time-frequency distribution function-
dc.subjectchirped-pulse amplification-
dc.subjectfemtosecond laser-
dc.subjectAbsolute phase-
dc.subject절대 위상-
dc.subject진화 알고리즘-
dc.subject위그너 시간-주파수 분포 함수-
dc.subject처프 펄스 증폭-
dc.subject펨토초 레이저-
dc.titleMeasurements and active control of the temporal characteristics of femtosecond laser pulses = 펨토초 레이저 펄스의 시간특성 측정과 능동적 제어-
dc.description.department한국과학기술원 : 물리학과, -
dc.contributor.localauthorHong, Kyung-Han-
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