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

Cited 0 time in webofscience Cited 0 time in scopus
  • Hit : 374
  • Download : 0
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...
Advisors
Nam, Chang-Heeresearcher남창희researcher
Description
한국과학기술원 : 물리학과,
Publisher
한국과학기술원
Issue Date
2003
Identifier
180929/325007 / 000985401
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 물리학과, 2003.2, [ [iv], 86 p. ]

Keywords

Evolutionary algorithm; Wigner time-frequency distribution function; chirped-pulse amplification; femtosecond laser; Absolute phase; 절대 위상; 진화 알고리즘; 위그너 시간-주파수 분포 함수; 처프 펄스 증폭; 펨토초 레이저

URI
http://hdl.handle.net/10203/47304
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=180929&flag=dissertation
Appears in Collection
PH-Theses_Ph.D.(박사논문)
Files in This Item
There are no files associated with this item.

qr_code

  • mendeley

    citeulike


rss_1.0 rss_2.0 atom_1.0