Effect of transverse magnetic fields on high harmonic generation in intense laser-solid interaction

J. Mu, F.-Y. Li, Z.-M. Sheng, J. Zhang

Research output: Contribution to journalArticle

Abstract

The effect of transverse magnetic fields on surface high harmonic generation in intense laser-solid interactions is investigated. It is shown that the longitudinal motion of electrons can be coupled with the transverse motion via the magnetic fields, which lead to even-order harmonics under normal laser incidence. The dependence of the coupling efficiency and hence even harmonic generation with preplasma scalelength and magnetic field strength are presented based upon particle-in-cell simulations. When the magnetic field is parallel to the laser electric field, the spectral intensity of the second harmonic is proportional to the magnetic field strength in a wide range up to 160MG, while the situation with the magnetic field perpendicular to the laser electric field is more complicated. The second harmonic generation due to the magnetic field also tends to increase with the plasma density scalelengths, which is different from the high harmonics generation by the oscillating mirror mechanism. With the increase of the laser spot size from a laser wavelength λL, both the magnetic field induced harmonics and oscillating mirror high harmonics tend to increase first and then become saturated after 3λL. The magnetic field induced second harmonic may be used to evaluate large self-generated magnetic fields developed near the critical density region and the preplasma conditions.
LanguageEnglish
Pages545-551
Number of pages6
JournalLaser and Particle Beams
Volume34
Issue number3
Early online date31 Aug 2016
DOIs
Publication statusPublished - 30 Sep 2016

Fingerprint

Solid state lasers
Harmonic generation
harmonic generations
Magnetic fields
magnetic fields
lasers
interactions
harmonics
Lasers
field strength
Mirrors
Electric fields
mirrors
electric fields
Plasma density
plasma density
incidence
Wavelength
Electrons

Keywords

  • high harmonic generation
  • laser-plasma interaction
  • magnetic field
  • laser-solid interaction
  • longitudinal motion
  • magnetic field- induced harmonics
  • oscillating mirror high harmonics
  • particle-in-cell simulations

Cite this

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title = "Effect of transverse magnetic fields on high harmonic generation in intense laser-solid interaction",
abstract = "The effect of transverse magnetic fields on surface high harmonic generation in intense laser-solid interactions is investigated. It is shown that the longitudinal motion of electrons can be coupled with the transverse motion via the magnetic fields, which lead to even-order harmonics under normal laser incidence. The dependence of the coupling efficiency and hence even harmonic generation with preplasma scalelength and magnetic field strength are presented based upon particle-in-cell simulations. When the magnetic field is parallel to the laser electric field, the spectral intensity of the second harmonic is proportional to the magnetic field strength in a wide range up to 160MG, while the situation with the magnetic field perpendicular to the laser electric field is more complicated. The second harmonic generation due to the magnetic field also tends to increase with the plasma density scalelengths, which is different from the high harmonics generation by the oscillating mirror mechanism. With the increase of the laser spot size from a laser wavelength λL, both the magnetic field induced harmonics and oscillating mirror high harmonics tend to increase first and then become saturated after 3λL. The magnetic field induced second harmonic may be used to evaluate large self-generated magnetic fields developed near the critical density region and the preplasma conditions.",
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Effect of transverse magnetic fields on high harmonic generation in intense laser-solid interaction. / Mu, J.; Li, F.-Y.; Sheng, Z.-M.; Zhang, J.

In: Laser and Particle Beams, Vol. 34, No. 3, 30.09.2016, p. 545-551.

Research output: Contribution to journalArticle

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N2 - The effect of transverse magnetic fields on surface high harmonic generation in intense laser-solid interactions is investigated. It is shown that the longitudinal motion of electrons can be coupled with the transverse motion via the magnetic fields, which lead to even-order harmonics under normal laser incidence. The dependence of the coupling efficiency and hence even harmonic generation with preplasma scalelength and magnetic field strength are presented based upon particle-in-cell simulations. When the magnetic field is parallel to the laser electric field, the spectral intensity of the second harmonic is proportional to the magnetic field strength in a wide range up to 160MG, while the situation with the magnetic field perpendicular to the laser electric field is more complicated. The second harmonic generation due to the magnetic field also tends to increase with the plasma density scalelengths, which is different from the high harmonics generation by the oscillating mirror mechanism. With the increase of the laser spot size from a laser wavelength λL, both the magnetic field induced harmonics and oscillating mirror high harmonics tend to increase first and then become saturated after 3λL. The magnetic field induced second harmonic may be used to evaluate large self-generated magnetic fields developed near the critical density region and the preplasma conditions.

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