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The ablated depth and volume per laser pulse from an aluminum target were measured for pulse durations that ranged from 80 fs to 270 ps at an average fluence of ~100 J/cm2 and a wavelength of 0.8 μm. The ablated volume showed a flat maximum for subpicosecond pulses and a minimum for ~6 ps. The crater diameters were rather constant up to pulse durations of ~6 ps and increased for larger pulse durations. As a result, the ablated depth also showed a plateau for subpicosecond pulses but decreased monotonically with pulse duration. A physical interpretation of these results and their consequences for laser applications are discussed.
© 2005 Optical Society of America
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