High-brightness switchable multiwavelength remote laser in air

We demonstrate a harmonic-seeded switchable multiwavelength laser in air driven by intense midinfrared femtosecond laser pulses, in which population inversion occurs at an ultrafast time scale (i.e., less than {approx}200 fs) owing to direct formation of excited molecular nitrogen ions by strong-fie...

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Bibliographic Details
Published in:Physical review. A, Atomic, molecular, and optical physics Atomic, molecular, and optical physics, 2011-11, Vol.84 (5), Article 051802
Main Authors: Yao, Jinping, Zeng, Bin, Xu, Huailiang, Li, Guihua, Chu, Wei, Ni, Jielei, Zhang, Haisu, Chin, See Leang, Cheng, Ya, Xu, Zhizhan
Format: Article
Language:English
Subjects:
AIR
ATOMIC AND MOLECULAR PHYSICS
BRIGHTNESS
DETECTION
ELECTRONS
EXCITED STATES
INTERMEDIATE INFRARED RADIATION
IONIZATION
LASERS
MOLECULAR IONS
NITROGEN IONS
NONLINEAR PROBLEMS
PHOTON-MOLECULE COLLISIONS
POPULATION INVERSION
PULSES
VALENCE
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Summary:We demonstrate a harmonic-seeded switchable multiwavelength laser in air driven by intense midinfrared femtosecond laser pulses, in which population inversion occurs at an ultrafast time scale (i.e., less than {approx}200 fs) owing to direct formation of excited molecular nitrogen ions by strong-field ionization of inner-valence electrons. The bright multiwavelength laser in air opens the perspective for remote detection of multiple pollutants based on nonlinear optical spectroscopy.
ISSN:1050-2947
1094-1622
DOI:10.1103/PhysRevA.84.051802