37 citations · 42 across the 4 of their papers we have counts for
5 papers
Enhanced Population on Ionic Excited States by Synchronized Ionization and Multiphoton Resonance
Yewei Chen, Hongbin Lei, Quanjun Wang +12
We study population distributions and lasing actions of N_2^+ driven by femtosecond lasers with various wavelengths, and uncover an efficient ionic excitation mechanism induced by…
Role of rotational coherence in femtosecond-pulse-driven nitrogen ion lasing
Hongqiang Xie, Hongbin Lei, Guihua Li +7
We experimentally investigated the rotationally resolved polarization characteristics of N lasing at 391 and 428 nm using a pump-seed scheme. By varying the relative angle be…
Sub-cycle coherent control of ionic dynamics via transient ionization injection
Qian Zhang, Hongqiang Xie, Guihua Li +7
We investigate the interwoven dynamic evolutions of neutral nitrogen molecules together with nitrogen ions created through transient tunnel ionization in an intense laser field. By…
Spatiotemporal focusing does not always improve axial intensity localization
Ya Cheng, Hongqiang Xie, Zhaohui Wang +6
We report on an experimental comparison on critical intensities of nonlinear self-focusing in air with conventional focusing and spatiotemporal focusing schemes. Our results show t…
Backward air lasing actions induced by femtosecond laser filamentation: influence of population inversion lifetime
Hongqiang Xie, Guihua Li, Wei chu +5
We experimentally investigate generation of backward 357 nm N2 laser in a gas mixture of N2/Ar using 800-nm femtosecond laser pulses, and examine the involved gain dynamics based o…