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  • A novel of coherent THz emission source : Plasma dipole oscillators (PDOs) 

Figure: PDOs generated helium gas system. (a) In the first step, two slightly detuned laser pulses collide in underdense plasma. (b) In the second step, plasma electrons are trapped due to ponderomotive potential of beat wave and charge separation occurs to build up dipole field. (c) Finally, after laser pulses pass through, electron blocks are oscillated, and THz pulse can be simultaneously emitted.

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