Chirp characterization analysis in ultrashort pulse using frequency-resolved optical gating (FROG) and modified spectrum autointerferometric correlation (MOSAIC)

• Main Authors: Guo-Shuen Wen, 溫國舜
• Other Authors: 林家弘
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/cs7rj9

碩士 === 國立臺北科技大學 === 光電工程系研究所 === 99 === This thesis use frequency-resolved optical gating (FROG) and modified spectrum autointerferometric correlation (MOSAIC) to analyse chirp that pulse through a specific optical elements. According to the principle of FROG, we can calculate the MOSAIC envelope shapes from time delay spectrum which obtained from the experiment, and then we can get the magnitude of chirp quickly, the result we will compare with the intensity and phase that we retrieved from time delay spectrum which obtained from the experiment. In addition, we also calculate the hybrid-MOSAIC shapes, not only can observe the chirp, but also high order dispersion. In the experiment, a time delay spectrum is produced with Ti: sapphire laser pulses that through a dispersion medium, and then we retrieve the intensity and phase and calculate the hybrid-MOSAIC shapes from the time delay spectrum, further we can analyse the magnitude of chirp and dispersion that caused by materials.