Measurements of the Inverse Faraday Effect from Relativistic Laser Interactions with an Underdense Plasma

Z. Najmudin 1 M. Tatarakis 1 A. Pukhov 2 E. L. Clark 1 R.J. Clarke 3 A.E. Dangor 1 Jérôme Faure 4 Victor Malka 4 D. Neely 3 M. I. K. Santala 1 K. Krushelnick 1
1 Blackett Laboratory
2 MPQ - Max-Planck-Institut für Quantenoptik
3 CLF - Central Laser Facility
4 LULI - Laboratoire pour l'utilisation des lasers intenses
Abstract : Magnetic fields in excess of 7 MG have been measured with high spatial and temporal precision during interactions of a circularly polarized laser pulse with an underdense helium plasma at intensities up to 1×10^19Wcm^-2. The fields, while of the form expected from the inverse Faraday effect for a cold plasma, are much larger than expected, and have a duration approaching that of the high intensity laser pulse ( <3psec). These observations can be explained by particle-in-cell simulations in 3D. The simulations show that the magnetic field is generated by fast electrons which spiral around the axis of the channel created by the laser field.
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Submitted on : Thursday, September 23, 2010 - 3:35:12 PM
Last modification on : Thursday, March 21, 2019 - 2:27:29 PM

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Z. Najmudin, M. Tatarakis, A. Pukhov, E. L. Clark, R.J. Clarke, et al.. Measurements of the Inverse Faraday Effect from Relativistic Laser Interactions with an Underdense Plasma. Physical Review Letters, American Physical Society, 2001, 87 (21), pp.215004. ⟨10.1103/PhysRevLett.87.215004⟩. ⟨hal-00520546⟩

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