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Using the one dimensional particle in cell simulation code, we have studied the generation and redshift of harmonics from overcritical plasma layer irradiated by ultrashort intense laser pulses. Except for the strong oscillations of target surface driven by the laser field, the light pressure of the intense laser can ablate and push the target suface, which is the reason for the redshift of harmonics.
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Keywords:
- redshift /
- ultrashort intense laser pulse /
- high-order harmonics /
- particle-in cell simulations
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