Abstract
Waveguide properties of the hollow rough ceramic capillaries were measured in experiments with the discharge-pumped KrF laser. Capillaries had inner diameter 1 mm, the length up to 34 cm with wall irregularities ∼5 μm in height and ∼100 μm in length along the capillary axes. Due to wall roughness the measured capillary transmittance appeared to be much less than the geometrical one in a perfect capillary with a smooth wall. It was shown that rough-wall capillaries transform radiation distribution along the channel and produce near-diffraction limited output radiation, even if the input multimode laser beam have a divergence tenfold higher than the diffraction one.
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