Abstract
A new technique is described for the observation of filamentation in laser-produced plasmas. Results are presented using this technique with ultra-short pulses from a neodymium laser. The experiments show a very rapid growth of filaments which can continue to propagate through considerable depths of transparent material. The results are shown to be consistent with a thermal self-focusing model, rather than purely ponderomotive self-focusing. Teh extended propagation of the filaments may have important consequences for the integrity of laser fusion targets.
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