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 …

The formation of coherent macroscopic states and the manipulation of their entanglement
using external stimuli are essential for emerging quantum applications. However, the …

We show that the intensity of self-seeded N 2+ lasing at 391 nm, assigned to the B 2 Σ
u+(v′= 0)→ X 2 Σ g+(v′′= 0) emission, is enhanced by 2 orders of magnitude by …

Air lasing is a concept that refers to remote no-cavity (mirrorless) optical amplification in
ambient air with the air constituents as the gain media. Due to the high potential of air lasing …

Air lasing refers to the remote optical pumping of the constituents of ambient air that results
in a directional laserlike emission from the pumped region. Intense current investigations of …

The task of identifying explosives, hazardous chemicals, and biological materials from a safe
distance is the subject we consider. Much of the prior work on stand-off spectroscopy using …

Nitrogen molecules pumped by intense femtosecond laser pulses give rise to coherent
emission in the forward direction at a series of wavelengths, coined “air lasing.” We …

Intense x-ray and extreme ultraviolet (XUV) light sources have been available for decades,
however, due to weak nonlinear interaction in the XUV photon energy range, observation of …

Singly ionized nitrogen molecules in ambient air pumped by 800 nm femtosecond laser give
rise to superradiant emission. Here, we study this superradiance by injecting a pair of …

It is known that in an intense laser field of a sufficiently high strength combined with a
sufficiently long wavelength, ie, in the regime of the Keldysh parameter γ< 1, photoionization …