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Exploration of the origin of anomalous dependence for near-threshold harmonics in H 2 + on the ellipticity of driving laser fields

Avanaki, K Nasiri ; Telnov, Dmitry A ; Chu, Shih-I

Journal of physics. B, Atomic, molecular, and optical physics, 2016-05, Vol.49 (11) [Periódico revisado por pares]

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Título:
Exploration of the origin of anomalous dependence for near-threshold harmonics in H 2 + on the ellipticity of driving laser fields
Autor: Avanaki, K Nasiri ; Telnov, Dmitry A ; Chu, Shih-I
Assuntos: elliptical laser field ; harmonic generation ; near-resonant excitation ; near-threshold harmonics
É parte de: Journal of physics. B, Atomic, molecular, and optical physics, 2016-05, Vol.49 (11)
Notas: JPHYSB-102507.R1
Descrição: The anomalous dependence of near-threshold harmonics in the H 2 + molecular ion on the ellipticity of the driving near-infrared laser field is studied theoretically based on accurate solution of the time-dependent Schrödinger equation in prolate spheroidal coordinates with the help of the generalized pseudospectral method. For these harmonics, the maximum radiation energy corresponds to a non-zero ellipticity of the driving field. Our analysis reveals that the origin of the phenomenon lies in the near-resonant excitation of π-symmetry molecular orbitals. The excited states responsible for the anomalous ellipticity dependence of different near-threshold harmonics are identified. The effect is confirmed at the equilibrium internuclear separation R = 2 a.u. as well as for stretched molecules at R = 3 a.u.
Editor: IOP Publishing
Idioma: Inglês

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