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Observation of a Long-Wavelength Hosing Modulation of a High-Intensity Laser Pulse in Underdense Plasma

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arxiv 1007.3237 v1 pith:ZT3VNLM4 submitted 2010-07-19 physics.plasm-ph physics.acc-ph

M. C. Kaluza , S. P. D. Mangles , A. G. R. Thomas , Z. Najmudin , A. E. Dangor , C. D. Murphy , J. L. Collier , E. J. Divall
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P. S. Foster C. J. Hooker A. J. Langley J. Smith K. Krushelnick
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classification physics.plasm-phphysics.acc-ph
keywords laserhosingpulseplasmahigh-intensitylambdalong-wavelengthmodulation
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We report the first experimental observation of a long-wavelength hosing modulation of a high-intensity laser pulse. Side-view images of the scattered optical radiation at the fundamental wave-length of the laser reveal a transverse oscillation of the laser pulse during its propagation through underdense plasma. The wavelength of the oscillation \lambda_hosing depends on the background plasma density n_e and scales as \lambda_hosing~n_e^-3/2. Comparisons with an analytical model and 2-dimensional particle-in-cell simulations reveal that this laser hosing can be induced by a spatio-temporal asymmetry of the intensity distribution in the laser focus which can be caused by a misalignment of the parabolic focussing mirror or of the diffraction gratings in the pulse compressor.

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