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The propagation properties of high peak-power ultrashort pulses through air are being studied. When the pulsewidths are as short as 100fs, laser pulses with less than 1 mJ of energy have peak powers exceeding the critical power for self-focusing. For the first time, it was observed that these pulses self-channel into a filament with a diameter of 50μm-100μm and propagate through distances greater than 30 meters. The propagation of these pulses have interesting applications such as laser induced lightning [1] and laser pumped x-ray sources [2].
© 1994 Optical Society of America
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