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Pure Even Harmonic Generation from Oriented N2 in Two-color Field

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Abstract

Recent study on high harmonic generation(HHG) from oriented CO have shown the generation of pure even harmonics because of the permanent dipole moment in linearly polarized laser fields. In order to make it sure if permanent dipole moment results in the generation, we investigate the HHG of nonpolar molecular N2 in two-color field using time-dependent Hartree-Fock theory. The molecular axis is directed along the z axis. If linear laser fields are polarized along the y axis, there is no harmonic generation from z-axis direction. However, adding a static field (or THz) to the z axis, pure even harmonics are generated from the z-axis direction miraculously (shown in Fig.1). the results reveal the permanent dipole moment indeed results in the generation of pure even harmonics. From this, a deeply research about the influence of permanent dipole moment on HHG is necessary and it may enlighten us to generate shorter attosecond pulse in the future.

© 2018 The Author(s)

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