Rotational quantum beat lasing without inversion
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 …
lower state to break the reciprocity between absorption and stimulated emission. However …
Generation of vortex N2 + lasing
Y Hu, Z Ye, H Li, C Lu, F Chen, J Wang, S Pan… - Optica, 2023 - opg.optica.org
Harnessing structured light is fascinating for its multidisciplinary applications, eg, in remote
driving microrobots, sensing, communications, and ultrahigh resolution imaging. Here, we …
driving microrobots, sensing, communications, and ultrahigh resolution imaging. Here, we …
Bidirectional cascaded superfluorescent lasing in air enabled by resonant third harmonic photon exchange from nitrogen to argon
Cavity-free lasing in atmospheric air has stimulated intense research toward a fundamental
understanding of underlying physical mechanisms. In this Letter, we identify a new …
understanding of underlying physical mechanisms. In this Letter, we identify a new …
Structured air lasing of N2+
Air lasing is a simple and promising technique to efficiently produce coherent light in the
atmosphere. Yet, its capability to obtain structured light like optical vortices or vector beams …
atmosphere. Yet, its capability to obtain structured light like optical vortices or vector beams …
Giant Enhancement of Air Lasing by Complete Population Inversion in
H Li, E Lötstedt, H Li, Y Zhou, N Dong, L Deng, P Lu… - Physical Review Letters, 2020 - APS
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 …
technology for control of molecular processes. When a light field intensity is increased to the …
Coherent control of the multiple wavelength lasing of : coherence transfer and beyond
X Zhang, Q Lu, Z Zhang, Z Fan, D Zhou, Q Liang… - Optica, 2021 - opg.optica.org
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 …
emission in the forward direction at a series of wavelengths, coined “air lasing.” We …
Coherent electronic-vibrational dynamics in deuterium bromide probed via attosecond transient-absorption spectroscopy
Ultrafast laser excitation can trigger complex coherent dynamics in molecules. Here, we
report attosecond transient-absorption experiments addressing simultaneous probing of …
report attosecond transient-absorption experiments addressing simultaneous probing of …
Influence of polarization ellipticity on lasing in a strong laser field
A near-infrared femtosecond laser pulse produces laserlike coherent radiation from singly
ionized N 2+ molecules when it experiences filamentation in air or pure nitrogen, and the …
ionized N 2+ molecules when it experiences filamentation in air or pure nitrogen, and the …
Amplification of light pulses with orbital angular momentum (OAM) in nitrogen ions lasing
Nitrogen ions pumped by intense femtosecond laser pulses give rise to optical amplification
in the ultraviolet range. Here, we demonstrated that a seed light pulse carrying orbital …
in the ultraviolet range. Here, we demonstrated that a seed light pulse carrying orbital …
Role of rotational coherence in femtosecond-pulse-driven nitrogen ion lasing
H **e, H Lei, G Li, Q Zhang, X Wang, J Zhao… - Physical Review …, 2020 - APS
We experimentally investigated the rotationally resolved polarization characteristics of N 2+
lasing at 391 and 428 nm using a pump-seed scheme. By varying the relative angle …
lasing at 391 and 428 nm using a pump-seed scheme. By varying the relative angle …