| Summary: | 碩士 === 國立交通大學 === 電子物理系所 === 102 === DAP:NP(2,6-diaminopyridine-4-nitrophenolate-4-nitrophenol) crystals are the new organic nonlinear optical materials. In this study, we have firstly generated the THz radiation from DAP:NP crystals by using femtosecond laser pulses. The amplitude of THz radiation is strongly dependent on the azimuthal angle of DAP:NP crystals and show the six-fold symmetry with the configuration of P-polarized pump and P-polarized probe (Ppump-Pprobe), two-fold symmetry with the configuration of S-polarized pump and P-polarized probe (Spump-Pprobe). These results indicate that the THz generation mechanism is optical rectification, which is also consistent with the theoretical calculations. Moreover, the crystal structure and optical properties of DAP:NP crystals were also studied by the x-ray diffractometer, UV-VI-NIR spectrometer, and second harmonic generation system.
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