Femtosecond laser filamentation is a unique nonlinear optical phenomenon when high-
power ultrafast laser propagation in all transparent optical media. During filamentation in the …

Recent studies have demonstrated that femtosecond laser pulses have high potential in
application to environmental science. Because of the properties of ultrafast, broadband and …

Filamentation of ultrashort laser pulses in the atmosphere offers unique opportunities for
long-range transmission of high-power laser radiation and standoff detection. With the …

We propose a new mechanism to explain the origin of optical gain in the transitions between
the excited and ground states of the ionized nitrogen molecule following irradiation of …

The diffraction-compensated propagation of high-power laser beams in air could open up
new opportunities for atmospheric applications such as remote stand-off detection, long …

The generation of power-and wavelength-scalable few optical cycle pulses remains one of
the major challenges in modern laser physics. Over the past decade, the development of …

We report on the lasing in air and pure nitrogen gas pumped by a single 800 nm
femtosecond laser pulse. Depending on gas pressure, incident laser power and beam …

We report on strong backward stimulated emission at 337 nm in nitrogen gas pumped by
circularly polarized femtosecond laser pulses at 800 nm. A distinct dependence of the …

We experimentally demonstrate the generation of narrow-bandwidth emissions with
excellent coherent properties at∼ 391 and∼ 428 nm from N 2+(B 2 Σ u+(v'= 0)→ X 2 Σ …

Filamentation of ultra-short TW-class lasers recently opened new perspectives in
atmospheric research. Laser filaments are self-sustained light structures of 0.1–1 mm in …