High harmonics generated due to the scattering of relativistic electrons from high intensity laser light is studied. The experiments are carried out with an Nd:Glass laser system with a peak intensity of in underdense plasma. It is shown that, at high intensities, when the normalized electric field approaches unity, in addition to the conventional atomic harmonics from bound electrons there is significant contribution to the harmonic spectrum from free electrons. The characteristic signatures of this are found to be the emission of even order harmonics, linear dependence on the electron density, significant amount of harmonics even with circular polarization and a much smaller spatial region over which these harmonics are produced as compared to the atomic case. Imaging of the harmonic beam shows that it is emitted in a narrow cone with a divergence of 2 to 3 degrees.
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May 2002
Review,Tutorial and Invited Papers from the 43rd Annual Meeting of the APS Division of Plasma Physics
29 Oct-2 Nov 2001
Long Beach, California (USA)
Research Article|
May 01 2002
High harmonic generation in relativistic laser–plasma interaction
S. Banerjee;
S. Banerjee
Center for Ultrafast Optical Science, University of Michigan, Ann Arbor, Michigan 48109
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A. R. Valenzuela;
A. R. Valenzuela
Center for Ultrafast Optical Science, University of Michigan, Ann Arbor, Michigan 48109
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R. C. Shah;
R. C. Shah
Center for Ultrafast Optical Science, University of Michigan, Ann Arbor, Michigan 48109
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A. Maksimchuk;
A. Maksimchuk
Center for Ultrafast Optical Science, University of Michigan, Ann Arbor, Michigan 48109
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D. Umstadter
D. Umstadter
Center for Ultrafast Optical Science, University of Michigan, Ann Arbor, Michigan 48109
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Phys. Plasmas 9, 2393–2398 (2002)
Article history
Received:
November 02 2001
Accepted:
February 26 2002
Citation
S. Banerjee, A. R. Valenzuela, R. C. Shah, A. Maksimchuk, D. Umstadter; High harmonic generation in relativistic laser–plasma interaction. Phys. Plasmas 1 May 2002; 9 (5): 2393–2398. https://doi.org/10.1063/1.1470167
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