- 學位論文
結合非平衡單三光子自相關器與基因演算法來回溯短脈衝強度及相位
Phase and intensity retrieve of ultrashort pulses using unbalance three and one photon absorption correlation with genetic algorithm
並列摘要
In this thesis, we use both one photon autocorrelation (one-PA) and unbalance three photon autocorrelation (three-PA) to retrieve pulse intensity and phase. In this reconstruction method, we first get one harmonic signal by convert one photon absorption autocorrelation into frequency domain by Fourier-transformation to g. Similarly, we obtain the DC and third harmonic signal by the Fourier-transformation of three-PA. The error rate can be obtained from DC and third harmonic signal . In order to verify the accuracy of this method, we retrieve intensity and phase using Gaussian shape with a linear chirp and get a good retrieved reusult. In addition, we also use this method in asymmetry pulse and double Gaussian pulse with high order chirp, and demonstrate that this method can distinguish the direction of field. Moreover , we compare the retrieved results from balanced to unbalanced autocorrelation using three-photon's ,and demonstrate that using unbalanced three-photon autocorrealion can get a more precise field distribution.