超高速テラヘルツ時間領域分光装置のための研究開発

概要

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We report on our research and development aiming for realization of an ultrafast terahertz　time-domain spectroscopy (THz-TDS) system. To achieve the goal, we have proposed a new　asynchronous optical sampling method, in which an optical pulse train with its interval　incremented (or decremented) continuously and its one-cycle delayed replica are used as the　pump and probe pulses. We demonstrated a 3-msec single-scan measurement of a THz　waveform with a 312-ps time window. The relatively large timing-jitter （~10ps） of the lasersystem limited the detection bandwidth below 100 GHz. In addition, we also tried to　improvethe efficiency of photoconductive (PC) antennas, which are used as the emitter and detector in　the THz-TDS system, by optimizing the antenna design. We found that the emission efficiency　of the dipole-type PC antennas can be significantly improved by using a relatively long antenna　length (~70 μm) without much sacrificing the emission spectral bandwidth.
福井大学の論文