Generation of elliptical isolated attosecond pulse from oriented H2+ in a linearly polarized laser field |
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Institution: | Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China |
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Abstract: | We investigate the ellipticity of the high-order harmonic generation from the oriented H2+ exposed to a linearly polarized laser field by numerically solving the two-dimensional time-dependent Schrödinger equation (2D 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 angle θ=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. |
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Keywords: | high harmonic generation linearly polarized laser fields elliptical isolated attosecond pulse alignment angle two-center interference effect |
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