Figure 1
From: High-Energy, Short-Duration Bursts of Coherent Terahertz Radiation from an Embedded Plasma Dipole
Generation of the PDO and its emitted radiation. (a). A dipole moment is built up in the overlap region of the colliding laser pulses. (b) Generation of a dipole moment in plasma by the electrons trapped in a moving potential train. (c). After the laser pulses cross each other, the dipole block continues to oscillate. Radiation is emitted transversely through a narrow layer of plasma during the dipole build-up period and successive plasma oscillations.
