In standard lasers, light amplification requires population inversion between an upper and a
lower state to break the reciprocity between absorption and stimulated emission. However …

Delayed cavity-free forward lasing at the wavelengths of 391 and 428 nm was observed in
recent experiments in air or pure nitrogen pumped with an intense femtosecond laser pulse …

We simulate the pump-probe experiments of lasing in molecular nitrogen ions with particular
interest in the effects of rotational wave-packet dynamics. Our computations demonstrate …

Cavity-free lasing of N 2+ induced by a femtosecond laser pulse at 800 nm is nearly totally
suppressed by a delayed twin control pulse. We explain this surprising effect within the V …

UV laser pulses at 266 nm with 170 ps duration and up to 300 mJ energy create UV
filaments. The effects of different beam preparation scenarios on UV filamentation are …

We present a model describing ionization and excitation of nitrogen molecules by a strong
and short laser pulse. Different from previous publications, both processes are considered …

We investigate the dependence of N 2+ lasing radiation on the polarization ellipticity of the
pump laser with the 900-and 980-nm wavelengths. Our results show that the 391-nm lasing …

A near-infrared laser generates gain on transitions between the B Σ u+ 2 and X Σ g+ 2 states
of the nitrogen molecular cation in part by coupling the X Σ g+ 2 and A Π u 2 states in the V …

摘要超**超快激光的出现与迅速发展开辟了原子分子物理, **场物理, 等离子体物理等学科的
诸多前沿方向, 促进了物质科学, 生命科学和信息能源等领域的创新发展. 以超**超快激光的**度 …

Multiple gain routes complicate the amplification behaviors of N 2+ lasing. A direct
comparison of the amplification processes of various lasing lines of N 2+ is still lacking to …