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Generation of elliptical isolated attosecond pulse from oriented H_(2)^(+)in a linearly polarized laser field

Chinese Physics B 2022年第4期31卷 281-286页

作者：邢云鹤张军霍晓鑫徐清芸刘学深 Institute of Atomic and Molecular Physics Jilin UniversityChangchun 130012China

We investigate the ellipticity of the high-order harmonic generation from the oriented H_(2)^(+)exposed to a linearly polarized laser field by numerically solving the two-dimensional time-dependent Schrodinger equation(2 D TDSE).Numerical simulations show that the harmonic ellipticity is remarkably sensitive to the alignment angle.The harmonic spectrum is highly elliptically polarized at a specific alignment angleθ=30°,which is insensitive to the variation of the laser parameters.The position of the harmonic intensity minima indicates the high ellipticity,which can be attributed to the two-center interference effect.The high ellipticity can be explained by the phase difference of the harmonics.This result facilitates the synthesis of a highly elliptical isolated attosecond pulse with duration down to 65 as,which can be served as a powerful tool to explore the ultrafast dynamics of molecules and study chiral light-matter interaction.

关键词： high harmonic generation linearly polarized laser fields elliptical isolated attosecond pulse alignment angle two-center interference effect

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Local scour around submerged angled spur dikes under ice cover

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International Journal of Sediment Research 2023年第6期38卷 781-793页

作者： Guowei Li Jueyi Sui Sanaz Sediqi Mauricio Dziedzic University of Northern British Columbia School of Engineering

Local scour is a phenomenon leading to the localized lowering of the channel bed due to the imbalance of sediment transport.As spur dikes protrude into the natural channels,local scour could be triggered.Accurate estimation of local scour around spur dikes is crucial for the effectiveness of erosion control and prevention and habitat enhancement measures.In the current study,the correlations between the maximum scour depth and the overtopping ratio,spur dike dimensions,ice cover roughness,and grain size of the bed material are investigated.Under both open channel and ice-covered flow conditions,a variety of experiments were done in a large-scale outdoor flume with different experimental setups.The results revealed that the scour depths around submerged spur dikes increased with increases in the densimetric Froude number and the decreases in the overtopping ratio and alignment angle.The maximum scour depth around a submerged angled vertical wall spur dike is significantly affected by the presence of an ice cover on the water surface,namely,the rougher the cover,the deeper the scour hole.Based on data collected from the laboratory experiments,an existing maximum scour depth estimation equation has been modified to consider the influence of the cover condition and the submergence level.The calculated results showed high accuracy in estimation of the measured data.

关键词： alignment angle Ice cover Local scour Submerged spur dike

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