Complete suppression of N$_2$ lasing by the nonadiabatic molecular alignment effect in femtosecond filaments - Archive ouverte HAL
Article Dans Une Revue Physical Review A Année : 2024

Complete suppression of N$_2$ lasing by the nonadiabatic molecular alignment effect in femtosecond filaments

Résumé

The nonadiabatic molecular alignment effect is commonly found helpful in enhancing nonlinear processes such as high-order harmonics and strong-field ionization. In this work, an opposite phenomenon is observed, in which the nonadiabatic molecular alignment effect prepared with a linearpolarized prepulse strongly suppresses the generation of N$_2$ lasing induced by circularly-polarized 800 nm femtosecond laser pulse in filament plasma. The presence of a weak prepulse periodically suppresses the lasing at each revival timing of the rotational wave packet of the N$_2$ molecule. The underlying mechanism of the lasing signal suppression is attributed to sudden change of the polarization ellipticity of the pump laser pulse. Theoretical simulations by numerically solving the time-dependent Schrödinger equation with the molecular alignment effect included confirm sensitive changes of the polarization ellipticity of the pump laser at every alignment revival, which largely supports our interpretation.
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Dates et versions

hal-04679407 , version 1 (27-08-2024)

Identifiants

Citer

Yuxuan Zhang, Renjun Yang, Mingyang Zhuzou, Aurélien Houard, André Mysyrowicz, et al.. Complete suppression of N$_2$ lasing by the nonadiabatic molecular alignment effect in femtosecond filaments. Physical Review A, 2024, 110 (2), pp.023106. ⟨10.1103/PhysRevA.110.023106⟩. ⟨hal-04679407⟩
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