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In the self-generated magnetic field produced by ultra-intense laser-plasma interaction or background magnetic field, even relativistic harmonics is excited by the ultra-intense laser propagating in underdense plasma which is magnetized by the self-generated magnetic field or backgroud magnetic field. In this paper, the second harmonics and its parameters are investigated.
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Keywords:
- second harmonic generation /
- self-generated magnetic field /
- ultra-intense laser pulse /
- underdense plasma
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