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(Color online) Sketch of THz radiation field with normalized beating frequency and the transverse distance from the z-axis, when , , , , and .
Dependence of THz radiation field on beam width and density ripple amplitude , when , and the other parameters are the same as in Fig. 1.
Variation of THz radiation generation efficiency with beating frequency ω, density ripple amplitude , and beam width for the same parameters as in Fig. 1.
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