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N₂⁺ lasing: gain and absorption in the presence of rotational coherence

From National Research Council Canada

Alternative titleN2+ lasing: gain and absorption in the presence of rotational coherence
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DOIResolve DOI: https://doi.org/10.1103/PhysRevA.102.013111
AuthorSearch for: 1ORCID identifier: https://orcid.org/0000-0003-4346-0552; Search for: ; Search for: ; Search for: ; Search for: ; Search for: 1
Affiliation
  1. National Research Council of Canada. Security and Disruptive Technologies
FormatText, Article
Abstract
We simulate the pump-probe experiments of lasing in molecular nitrogen ions with particular interest in the effects of rotational wave-packet dynamics. Our computations demonstrate that the coherent preparation of rotational wave packets in N₂⁺ by an intense short nonresonant pulse results in a modulation of the subsequent emission from B²Σu⁺→X²Σg⁺ transitions induced by a resonant seed pulse. We model the dynamics of such pumping and emission using density-matrix theory to describe the N₂⁺ dynamics and the Maxwell wave equation to model the seed pulse propagation. We show that the gain and absorption of a delayed seed pulse is dependent on the pump-seed delay, that is, the rotational coherences excited by the pump pulse can modulate the gain and absorption of the delayed seed pulse. Further, we demonstrate that the coherent rotational dynamics of the nitrogen ions can cause lasing without electronic inversion.
Publication date
PublisherAmerican Physical Society
In
  • Physical Review A 102, no. 1, 013111: 1–12.
LanguageEnglish
Peer reviewedYes
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Record identifier324c633c-8916-426b-a845-cb0cf094fa59
Record created2021-06-15
Record modified2021-06-16
Date modified: