Abstract
With long-pulse-duration (4 nsec), moderate-intensity (\ensuremath{\simeq}${10}^{13}$ W/${\mathrm{cm}}^{2}$) Nd-laser irradiation of flat targets, time-integrated images of $\frac{3}{2}{\ensuremath{\omega}}_{0}$ and $2{\ensuremath{\omega}}_{0}$ emission reveal filaments along the laser axis. Combined with fine-scale structure found in x-ray images, these filaments suggest self-focusing of hot spots in the incident beam.
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