For the first time, the propagation properties of intense, ultrashort pulses through air are being studied. The propagation of these pulses have interesting applications.1 When the pulsewidths are as short as 100 fs, laser pulses with less than 1 mJ of energy have peak powers exceeding the critical power for self-focusing. Therefore in high peak-power, femtosecond laser systems, self-focusing is a key consideration.

© 1994 Optical Society of America

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