Optical measurements and analytical modeling of magnetic field generated in a dieletric target |
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| Affiliation: | 1. MOE Key Laboratory of Advanced Micro-structured Materials, Institute of Precision Optical Engineering,School of Physics Science and Engineering, Tongji University, Shanghai 200092, People's Republic of China;2. State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences, Shanghai 201800, People's Republic of China;3. National Key Laboratory of Shock Wave and Detonation Physics, China Academy of Engineering Physics, Mianyang 621000, People's Republic of China;4. IFSA Collaborative Innovation Center, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China |
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| Abstract: | Polarization rotation of a probe pulse by the target is observed with the Faraday rotation method in the interaction of an intense laser pulse with a solid target.The rotation of the polarization plane of the probe pulse may result from a combined action of fused silica and diffused electrons.After the irradiation of the main pulse,the rotation angle changed significantly and lasted ～2 ps.These phenomena may imply a persistent magnetic field inside the target.An analytical model is developed to explain the experimental observation.The model indicates that a strong toroidal magnetic field is induced by an energetic electron beam.Meanwhile,an ionization channel is observed in the shadowgraph and extends at the speed of light after the irradiation of the main beam.The formation of this ionization channel is complex,and a simple explanation is given. |
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| Keywords: | magnetic field faraday rotation ionization channel |
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