The generation of a horizontal array of stable white-light continuum (WLC) filaments in water is observed using a cylindrical planoconvex lens. The widths of these filaments are measured both directly by imaging and indirectly through analysis of filament interference patterns. The stable interference pattern created by a filament pair is similar to that due to a pair of Young's slits, and implies a constant phase relationship between the WLC generated by each filament. The experimental results agree well with theoretical predictions for the number of fringes and the fringe spacing.
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