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(Color online) (a) Signal measured by EOS; a terahertz wave form generated in a -thick GaSe crystal using various electro-optic crystals. Note that the -thick ZnTe crystal yields a signal comparable to that of the thinner crystals, but without the early reflection echoes. (b) Modulus and (c) phase of the Fourier transform of the measured EOS signal for the (solid line) and (dotted line) ZnTe crystals. (d) Electric field of the incident terahertz pulses as obtained from the wave forms in (a) by applying Eq. (1). (e) Modulus and (f) phase of the spectrum of the terahertz pulse as obtained with the ZnTe crystal. For clarity, data are offset, and the time origin was shifted before Fourier transforming.
(Color online) (a) Modulus and (b) phase of the calculated EOS response function of ZnTe and GaP crystals with various thicknesses . The sampling pulse has a duration of and is centered at . Note the flat modulus and the constant phase of for the -thick crystal. Data are offset for clarity.
(Color online) Real part of the phase-matching factor for a -thick ZnTe detection crystal at three exemplary sampling wavelengths . Some nodes in for coincide with the maxima for . Taking the modulus of the average leads to a smoothing of the phase-matching oscillation, and averaging over the whole spectrum of the sampling pulse results in the flat curves in Figs. 2(a) and 2(b). Data are offset for clarity.
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