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Plasma dipole oscillation (PDO) depicted as harmonic motion of a spatiallylocalized block of electrons has, until now, been hypothetical. In practice,the plasma oscillation occurs always as a part of a plasma wave. Studies onradiation burst from plasmas have focused only on coupling of the plasma waveand electromagnetic wave. Here we show that a very-high-field PDO can begenerated by the electrons trapped in a moving train of potential wells. Theelectrons riding on the potential train coherently construct a local dipolemoment by charge separation. The subsequent PDO is found to persist stablyuntil its energy is emitted entirely via coherent radiation. In our novelmethod, the moving potentials are provided by two slightly-detuned laser pulsescolliding in a non-magnetized plasma. The radiated energy reaches severalmillijoules in the terahertz spectral region. The proposed method provides away of realizing the PDO as a new radiation source in the laboratory. PDO as amechanism of astrophysical radio-bursts is discussed.

Plasma Dipole Oscillation Excited by Trapped Electrons Leading to Bursts of Coherent Radiation