Generation scheme. An optical pulse focused to a line propagates in the nonlinear core of the sandwich structure and excites Cherenkov wedge of terahertz waves in the output prisms with low terahertz absorption.
The function (normalized to unity) in the cases (a) and (b) for different values of the parameter . (solid line), (dotted line), and (dashed line).
The terahertz fluence (normalized to unity) as a function of for (solid line), (dotted line), and (dashed line). The dashed-dotted line shows the function given by Eq. (27) [normalized by dividing by Eq. (25)].
Snapshot of the electric field at produced in a structure with by a Ti:sapphire laser pulse with duration and peak intensity . The interfaces are shown with the horizontal lines.
The spectral density of terahertz fluence generated by the optical pulse with (a) and (b) in the structure with (curves 1) and (curves 2). The optical pulse energy (per unit length of the line source) is fixed to for all curves. The spectrum of the optical intensity envelope is shown for corresponding with the dashed line.
The conversion efficiency per unit length of the structure as a function of and for (a) the fixed optical pulse energy and (b) fixed optical intensity . (c) The terahertz fluence as a function of and for the fixed optical intensity .
The conversion efficiency for a structure of a length as a function of and . Level curves of are shown with dashed line. The optical pulse energy (per unit length of the line source) is fixed to .
The power of the mode (normalized to the power of the Gaussian beam ) as a function of the ratio for the first four symmetric modes with (shown near the corresponding curves).
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