The effect of two-photon absorption and optical excitation area on the generation of THz radiation |
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Authors: | Qirong Xing Shuxin Li Kai Wang Lu Chai Qingyue Wang |
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Institution: | Ultrafast Laser Laboratory, School of Precision Instrument and Optoelectronics Engineering, Tianjin University, Tianjin 300072, PR China Key Laboratory of Optoelectronics Information and Technical Science (Tianjin University), Ministry of Education, Tianjin 300072, PR China |
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Abstract: | It was found experimentally that the THz radiation throughput based on optical rectification is strongly related to the optical excitation size in a ZeTe emitter. The factors affecting the THz radiation throughput are investigated in detail both experimentally and theoretically. By taking into account optical rectification, diffraction and two-photon absorption effects, a theoretical model is established to describe the emitting field intensity of THz radiation. There is excellent agreement between the theoretical results and the experimental data under high excitation power. Both theoretical and experimental results demonstrate that there is a trade-off between these three effects for THz radiation, and that in order to increase the THz radiation throughput based on optical rectification, one should choose suitable excitation size under a given pump power. |
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Keywords: | THz radiation Two-photon absorption Optical excitation area ZnTe |
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