Role of excited states in the elliptically polarized harmonic generation

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We theoretically investigate the contribution of the excited state to the ellipticity of the harmonics from H+2 at different orientation angles irradiated by a linearly polarized laser pulse. It is found that the first excited state has a significant influence to the ellipticity of the harmonics, and the contribution of higher excited states to the ellipticity can be neglected.Moreover, the conclusion is not dependent on the laser intensity. We theoretically investigate the contribution of the excited state to the ellipticity of the harmonics from H + 2 at different orientation angles irradiated by a linearly polarized laser pulse. It is found that the first excited state has a significant influence to the ellipticity of the harmonics, and the contribution of higher excited states to the ellipticity can be neglected. Moreover, the conclusion is not dependent on the laser intensity.
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