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Spatial structure and coherence properties of Brillouin scatter from CO2 laser‐target interaction

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6 Author(s)
Mitchel, G.R. ; Institut National de la Recherche Scientifique‐Energie Varennes, Québec, Canada, JOL 2PO ; Grek, B. ; Johnston, T.W. ; Pepin, H.
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The spatial structure and coherence properties of 10.6‐μm light scattered from CO2 laser‐target interactions in oblique incidence show many unexpected features. It is found that the Brillouin backscatter is neither a phase conjugate nor a ray retrace of the incident beam. Rather, it shows a preference for scattering directions other than those exactly antiparallel to the incident beam, apparently related to the angular distribution of the scattering source and also of the plasma corona that serves as the Brillouin amplifying medium. As well, the backscatter phasefront is strongly perturbed with respect to the incident phasefront. This is an indication of turbulence in the corona and/or memory of the structure in the source that is then amplified. Small‐scale structures seen in the reimaged backscatter are due to phase perturbation and cannot be simply interpreted as geometric images of a (filamented) source. The phasefront of light that is scattered obliquely from the plasma is much more coherent.

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Journal of Applied Physics  (Volume:53 ,  Issue: 5 )