Zhengquan Fan

TL;DR: In this paper, the existence of coherent polarizations coupling simultaneously ground state X (X2Σg+) to excited states A (A2Πu) and B (B 2Σu+) inside a plasma created by a short intense laser pulse at 800 nm.

TL;DR: It is shown that an interference of dipolar moments of excited ions created by electron recollisions explains the variation of superradiance intensity in ambient air exposed to an intense near-infrared femtosecond laser pulse.

TL;DR: A pair of resonant seeding pulses at different intensity ratios inside the nitrogen gas plasma provide a new level of control on the "air lasing" based on nitrogen ions, which can find potential applications in optical remote sensing.

TL;DR: In this article, a pair of resonant seeding pulses inside the nitrogen gas plasma were used to control the superradiant emission in air lasing, and the complex temporal evolution of the macroscopic coherence between two involved energy levels was revealed.

TL;DR: In this paper, a femtosecond sawtooth pulse composed of three optical harmonic fields was used for coherent control of boosted ultrashort terahertz pulses emitted from air plasma.