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Single-shot measurement of a terahertz field pulse waveform by electro-optic sampling using a chirped optical pulse and a spectrometer was demonstrated by and Jiang and Zhang [Appl. Phys. Lett. 72, 1945 (1998)]. 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 chirp rate of −0.24  THz², which corresponds to 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. In addition, we have derived an analytical expression for the terahertz field pulse waveform thus measured without using the method of stationary phase. 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. ©2008 American Institute of Physics

Contents

• INTRODUCTION
• THEORETICAL BACKGROUND
• EXPERIMENTAL PROCEDURE
• EXPERIMENTAL RESULTS AND DISCUSSION
  • A.Dependence of the terahertz field waveform on the chirp rate
  • B.Comparison between the experimental and calculated results
  • C.Dependence on spectral resolution of the spectrometer
  • D.Spectral bandwidth and resolution of terahertz spectroscopy using EODCP
• CONCLUSION
• ACKNOWLEDGMENTS
• REFERENCES
• FIGURES
• FOOTNOTES