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Intense femtosecond laser-plasma interactions can produce high power terahertz radiations. In our experiment, the polished copper target was irradiated by a p-polarized laser with intensity of more than 1018 W/cm2 at an incident angle of 67.5° from the target normal. The THz energy from three different detection angles is measured. The maximum emission is found in the direction at an angle of 45°...
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