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Schematic experimental setup for high energy terahertz generation and detection from two-color laser-induced filamentation in air. The inset (a) depicts the images of the multiple filaments for the FTL, positively chirped 130 fs and negatively chirped 105 fs pumps, respectively. The typical white light beam pattern of multiple filaments is shown in the inset (b).
Pump pulse duration dependence of terahertz emission with different filters in air. The dashed blue line denotes the FTL pump pulse duration.
Pump energy dependence of high energy terahertz generation with frequencies less than 5.5 THz in (a) and with the entire superbroadband terahertz frequencies in (b) under different pump pulse durations, respectively. “FTL” and “P” denote the FTL duration and the positively chirped pulse, respectively.
Pump pulse duration dependence of terahertz emission with different filters in argon at fixed pump energy of 23.5 mJ. The dashed blue line denotes the FTL pump pulse duration.
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