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Dependence on chirp rate and spectral resolution of the terahertz field pulse waveform measured by electro-optic detection using a chirped optical pulse and a spectrometer and its effect on terahertz spectroscopy

チャープ光学パルスと分光器を用いた電気光学的検出により測定されたテラヘルツ電場パルス波形のチャープ速度とスペクトル分解能依存性とテラヘルツ分光へのその依存性の効果

村上 洋; 清水 広平*; 桂田 雅章; 菜嶋 茂喜*

Murakami, Hiroshi; Shimizu, Kohei*; Katsurada, Masaaki; Nashima, Shigeki*

Single-shot measurement of a terahertz field pulse waveform by electro-optic sampling using a chirped optical pulse and a spectrometer was demonstrated by Jiang et al. We have performed an experimental and theoretical investigation into the dependence of the waveform thus measured on the chirp rate and spectral resolution. It was found that the waveform exhibits multicyclic behavior at a chirped pulse width of over 10 ps for the monocyclic original terahertz field, while it approaches the monocyclic behavior with decreasing pulse width. Further, broadening of the spectral resolution of the spectrometer gives rise to a monocyclic waveform in the chirp-rate range where the waveform is expected to be multicyclic. The theoretical results were found to be consistent with measured ones. Finally, we examined the spectral bandwidth and resolution of terahertz spectroscopy using this method.

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パーセンタイル:75

分野:Physics, Applied

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