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Terahertz induced Kerr effect in a (100) GaP crystal is reported. The measured dependence of the optical birefringence with respect to the azimuthal orientation of the crystal agrees with theoretical calculations. Additional electro-optic contribution to the detected signal is observed and attributed to crystal abnormity.
We report optical coherent control of the emission direction of THz radiation by excitation of bulk GaAs with femtosecond laser pulses. Changing the phase of the optical excitation, steering angles of ∼8 degrees are realized. A simple model is introduced to analyze the underlying parameters.
Laser driven terahertz radiation sources have been developed to enable energy modulation of relativistic electron bunches on a sub-picosecond timescale. Photoconductive and nonlinear optical generation schemes capable of providing the required > 1MV cm−1 field strengths, and longitudinal polarisation components, are discussed.
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