Abstract
Using phase-shaped millijoule 1030-nm femtosecond pulses generating a filament in a cell filled with N2, we obtain intense forward UV emission between vibrational manifolds of B 2 Σ and X 2 Σ states of N2 + for optimal pulse sequences. The effect is tentatively ascribed to wave-mixing between intense NIR pulses and weak supercontinuum components, resonant to the UV transitions, whereby a non- instantaneous nonlinear susceptibility is linked to rotational coherence in ions.
Highlights
UV emission from nitrogen in the plasma of femtosecond gas filaments has attracted attention as a prospective light source for stand-off spectroscopy [1, 2]
Distinct nitrogen fluorescence in the UV mainly results from plasma-chemical reactions in a filament which lead to the appearance of a large variety of neutral and ionic species in rotationally, vibrationally and electronically excited states. In this contribution we demonstrate, for the first time to the best of our knowledge, adaptive control over the efficiency of UV emission from nitrogen in a near-IR femtosecond filament using a spatial light-modulator (SLM)
Our explanation of the observed phenomenon is based on the interpretation of the rotational revival signatures in the presented shaped-pulse filamentation experiment and supporting evidence of additional time- and frequency-resolved measurements that will be presented elsewhere
Summary
UV emission from nitrogen in the plasma of femtosecond gas filaments has attracted attention as a prospective light source for stand-off spectroscopy [1, 2]. Using phase-shaped millijoule 1030-nm femtosecond pulses generating a filament in a cell filled with N2, we obtain intense forward UV emission between vibrational manifolds of B2Σ and X2Σ states of N2+ for optimal pulse sequences.
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