Remote or standoff detection of greenhouse gases, air pollutants, and biological agents with
innovative ultrafast laser technology attracts growing interests in recent years. Hybrid …

The research topic of air lasing is of fundamental and practical importance, which has grown
rapidly in the past decade. Air lasing, or a laser‐like emission from air species including …

Compact and smart optical gas sensors have attracted significant attention over the past few
decades. Among the materials used for developing such gas sensors, group-IV materials …

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 …

The Keldysh photoionization theory is a conceptual cornerstone and a universal framework
for the description of a broad class of fundamental effects in light–matter interaction. Here …

We pump low-pressure nitrogen gas with ionizing femtosecond laser pulses at 1.5 μ m
wavelength. The resulting rotationally excited N 2+ molecular ions generate directional …

A fine manipulation of population transfer among molecular quantum levels is a key
technology for control of molecular processes. When a light field intensity is increased to the …

We study the filamentation in air of multi-millijoule optical vortices and compare them with
the classical filamentation regime. The femtosecond vortex beam generates multiple plasma …

We present a novel approach for Stimulated Raman Scattering (SRS) spectroscopy in which
a hyper spectral resolution and high-speed spectral acquisition are achieved by employing …

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 …