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Optimization of High-Order Harmonic Generation & Optimization of Attosecond Pulses

Author: Xiao
Tutor: SunZhenRong
School: East China Normal University
Course: Optics
Keywords: High-order harmonic generation Attosecond pulses Genetic algorithm optimization Chirp An initial phase
CLC: TN24
Type: Master's thesis
Year: 2005
Downloads: 219
Quote: 1
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Abstract


The work of this thesis is divided into two parts: high-order harmonic generation using genetic algorithm optimization and optimization of the algorithm attosecond pulses. The first chapter of the thesis, first introduced high-order harmonic and attosecond pulse generation, application and development, and gives the principles and advantages of genetic algorithm optimization. In the second chapter, we optimized for high-order harmonic. Consider the quasi-classical model of propagation effects on the basis of these two parameters controlled by optimizing the laser pulse chirp'' and the \strengthen other words, for the optimization of a particular level sub-harmonic intensity, the optimum chirp value and the optimum initial phase value can be obtained by optimizing the procedure theoretically prophetic, and thereby bring an important reference for the experimental studies. In addition, we found that harmonic spectrum of the precise location of the cutoff frequency by selecting the harmonic order is optimized to adjust Finally, we discuss the fixed one parameter (chirp or an initial phase) and only with another parameter (the initial phase or chirp) to optimize a a harmonic intensity, select a different fixed parameter values ??observed another parameter value changes and harmonic spectrum changes as a result, we found an interesting phenomenon: change the fixed chirp, fluctuations in the value of the optimum phase, on the contrary, if you change the fixed phase value, the best chirp value change is very small, chirp harmonic spectrum cutoff frequency than the initial phase is much greater in the third chapter, we optimized attosecond pulses first near the cut-off frequency of the higher harmonic synthesis of single attosecond pulse chirp and initial phase of the laser pulse control ultrashort (5fs), and then by the genetic algorithm to optimize the single attosecond pulses. optimization results found that single attosecond pulse intensity is enhanced by one to two orders of magnitude, and the pulse width is greatly narrowed. Besides, we also considered the propagation effects due to A pulse width and shape of the second pulse in a certain propagation distance is essentially the same, while the peak intensity there is an oscillation ups and downs, so we select an optimal propagation distance single attosecond pulse peak intensity of the strongest final chapter of this thesis The main work and the future direction of development summary and outlook.

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