Schematics of an optical pulse with tilted intensity front and the radiation pattern produced by the pulse in an electro-optic crystal.
The frequency and the angles of the group and phase fronts of the phase-matched terahertz wave as functions of for with negligible damping excited with Ti:sapphire laser.
Total terahertz field (solid line), near field (filled squares), and phase-matched wave (open circles) plotted on the basis of Eqs. (8), (10), and (12), respectively, for different (shown on the frames). Parameters used correspond to the excitation of with Ti:sapphire laser (, ) at 10 K [(a)–(c)] and 300 K (d).
Snapshots of the electric field produced in with Ti:sapphire laser (, , and ). The temperature and are shown on the frames. The dotted line shows the transverse profile of the optical intensity.
The distributions and for the crystal excited with Ti:sapphire laser (, , and ). The temperature and are shown on the panels. The interval of , where the optical pulse exists, is marked (at the half-maximum level) by dashed lines.
The spectral density of the terahertz energy in dependence on [(a) and (c)] and [(b) and (d)] at 10 K and for [(a) and (b)] the fixed energy and [(c) and (d)] fixed intensity of the optical pulse. At the right sides of the panels, the terahertz energy is shown as a function of [(a) and (c)] and [(b) and (d)]. In (a) and (c) , in (b) and (d) .
The terahertz energy as a function of at 10 K for and . The dashed curve shows the energy passed through the interval .
The spectral density of the terahertz energy as a function of and at 300 K for different parameters of the optical pulse: , (a), , (b), , (c), and , (d). At the right sides of the panels, the terahertz energy is shown as a function of . The optical pulse energy is fixed to .
The optical-to-terahertz conversion efficiency as a function of and at 300 K for the fixed optical pulse energy (a) and fixed optical intensity (b). The tilt angle is .
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