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 THz wave generation.
Click here for original story, Anti-correlated plasma and THz pulse generation during two-color laser filamentation in air
Source: Phys.org