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Well-defined and highly reproducible channels of afew micrometres diameter and lengths of over 1mm have been produced in quartz with laser pulses of 790nm wavelength (Ti:sapphire) and pulse lengths of 100200fs. The channel depth can be controlled by the laser fluence and number of laser shots. Comparisons were made with laser pulse lengths of 1.3ps, 2.8ps, 30ps, and 5ns. The micromachining produced...