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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
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10.1063/1.3021151
/content/aip/journal/jap/104/10/10.1063/1.3021151
http://aip.metastore.ingenta.com/content/aip/journal/jap/104/10/10.1063/1.3021151
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

The schematic diagram of the experimental setup for the EODCP of the terahertz field pulse with a spectrometer equipped with a CCD image sensor. A double-beam configuration was employed to obtain the probe pulses with modulation due to the terahertz field and without it simultaneously. ITO is indium tin oxide.

Image of FIG. 2.
FIG. 2.

(a) The terahertz field waveforms obtained by EODCP at five delay times between the input terahertz field and chirped probe pulses, at a chirp rate of . The ordinate of each waveform is shifted for the sake of clarity. (b) Corresponding peak positions [arrow in (a)] in the terahertz waveform, represented by frequency, plotted as a function of the delay time (open squares). The chirp rate is obtained from the slope of the solid line fitted to the data. The upper abscissa is derived from the lower one using the chirp rate value in (a). (c) The waveform obtained by EODCP (black line) at is compared with that obtained by THz-TDS (thick gray line).

Image of FIG. 3.
FIG. 3.

Terahertz field waveforms obtained by EODCP at five delay times, at a chirp rate of . The ordinate of each waveform is shifted for the sake of clarity. The upper abscissa is derived from the lower one using the chirp rate value.

Image of FIG. 4.
FIG. 4.

The terahertz field waveforms calculated from Eq. (4) at three delay times and a chirp rate of , where , , and . The ordinate of each waveform is shifted for the sake of clarity. The original terahertz field waveform, in Eq. (1), is depicted in the inset. The values of and are fixed for the calculations below.

Image of FIG. 5.
FIG. 5.

Chirp rate dependence of the terahertz field waveform calculated from Eq. (4), where , , and , with . The chirp rate value is given by . The ordinate of each waveform is shifted for the sake of clarity.

Image of FIG. 6.
FIG. 6.

(a) Terahertz field waveforms measured by EODCP at two spectral resolutions of the spectrometer [0.2 nm (black line) and 3 nm (thick gray line)] at a chirp rate of . (b) Frequency spectra obtained from the Fourier transforms of the two terahertz field waveforms, together with that obtained by THz-TDS. A logarithmic scale is used for the ordinate.

Image of FIG. 7.
FIG. 7.

Terahertz field waveform calculated from Eq. (3) through numerical integration of Eq. (2) at a chirp rate of , where the -function and Gaussian functions with widths of 0.2, 0.6, and 3.4 nm are used for . The ordinate of each waveform is shifted for the sake of clarity.

Image of FIG. 8.
FIG. 8.

Frequency spectra obtained from the Fourier transform of the terahertz field waveform calculated from Eq. (4) at a chirp rate of (black line) and the original waveform (thick gray line). The frequency spectrum obtained by EODCP (experiment) at is plotted, where the ordinate is shifted for the sake of clarity. A logarithmic scale is used for the ordinate.

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/content/aip/journal/jap/104/10/10.1063/1.3021151
2008-11-20
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: 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
http://aip.metastore.ingenta.com/content/aip/journal/jap/104/10/10.1063/1.3021151
10.1063/1.3021151
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