Anti-Correlated Plasma and THz Pulse Generation during Two-Color Laser Filamentation in Air
(a) Experimental and simulation results of THz yield as a function of . The generated THz efficiency as a function of in the experiment is shown as the black solid line, while the simulated THz relative intensities of the empirical model is represented as blue dashed line. Free electron density with different retardations was measured on the filament axis at mm and shown as red dash-dotted line. (b) The THz waveform autocorrelation trace and the THz spectrum in the experiment when .