Anti-correlated plasma and THz pulse generation during two-color laser filamentation in air

The strong terahertz (THz) waves generated by femtosecond laser pulse induced gas plasma have drawn extensive attention owing to the ultra-wide spectral bandwidth, the high electric field strength, and no material damage threshold. However, the abundant and multi-dimensional cross-scale light-matter interactions during filamentation intertwine, interact and restrict mutually, which not only puts the physical mechanism of THz radiation under debate, but also limits the optimization techniques of ...