Broadening and shift of emission lines in a plasma of filaments generated by a tightly focused femtosecond laser pulse in air

We study the broadening and shift of N I (λ = 746.8 nm) and O I ( λ = 777.4 nm) lines in a plasma of filaments generated by a tightly focused femtosecond laser pulse (0.9 mJ, 48 fs). It is shown that the dynamic Stark effect makes a major contribution to the broadening and shift of the N I line (λ =...

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Bibliographic Details
Published in:Quantum electronics (Woodbury, N.Y.) N.Y.), 2018-02, Vol.48 (2), p.149-156
Main Authors: Ilyin, A.A., Golik, S.S., Shmirko, K.A., Mayor, A.Yu, Proschenko, D.Yu, Kulchin, Yu.N.
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
AMPLIFIERS
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
dynamic Stark effect
EMISSION
ENERGY LEVELS
Femtosecond pulses
filament
FILAMENTS
LASERS
line broadening and shift
PLASMA
PULSES
Rabi splitting
Spontaneous emission
STARK EFFECT
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Summary:We study the broadening and shift of N I (λ = 746.8 nm) and O I ( λ = 777.4 nm) lines in a plasma of filaments generated by a tightly focused femtosecond laser pulse (0.9 mJ, 48 fs). It is shown that the dynamic Stark effect makes a major contribution to the broadening and shift of the N I line (λ = 746.8 nm). It is found that amplified spontaneous emission of a regenerative amplifier and post-pulses break the LS coupling for the O I 3p 5P energy level, lead to the generation of side bands related to the Rabi splitting of levels and result in pulsed emission of the first positive system of N2.
ISSN:1063-7818
1468-4799
DOI:10.1070/QEL16504