High-brightness switchable multi-wavelength remote laser in air
Jinping Yao, Bin Zeng, Huailiang Xu, Guihua Li, Wei Chu, Jielei Ni,, Haisu Zhang, See Leang Chin, Ya Cheng, and Zhizhan Xu

TL;DR
This paper reports the first demonstration of a switchable multi-wavelength remote laser in air driven by mid-infrared femtosecond pulses, enabling potential multi-gas detection for remote sensing applications.
Contribution
It introduces a novel harmonic-seeded multi-wavelength laser in air with ultrafast population inversion, differing from previous mechanisms and expanding remote sensing capabilities.
Findings
Achieved switchable multi-wavelength laser in air
Population inversion occurs in less than 200 fs
Enables remote detection of multiple pollutants
Abstract
Remote laser in air based on amplified spontaneous emission (ASE) has produced rather well-collimated coherent beams in both backward and forward propagation directions, opening up possibilities for new remote sensing approaches. The remote ASE-based lasers were shown to enable operation either at ~391 and 337 nm using molecular nitrogen or at ~845 nm using molecular oxygen as gain medium, depending on the employed pump lasers. To date, a multi-wavelength laser in air that allows for dynamically switching the operating wavelength has not yet been achieved, although this type of laser is certainly of high importance for detecting multiple hazard gases. In this Letter, we demonstrate, for the first time to our knowledge, a harmonic-seeded switchable multi-wavelength laser in air driven by intense mid-infrared femtosecond laser pulses. Furthermore, population inversion in the…
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