Journal
APPLIED PHYSICS B-LASERS AND OPTICS
Volume 91, Issue 1, Pages 35-43Publisher
SPRINGER
DOI: 10.1007/s00340-008-2959-9
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We have identified the pulse self-compression region in a filament produced by 55 fs, 4 mJ, 805 nm radiation propagating in air without geometrical focusing. In our experiment the pulse self-compression region is attained by the propagation distance, where the shortest wavelength in the supercontinuum blue wing reaches a minimum, and the growing conversion efficiency to white light has a large gradient. Numerical tracking of the pulse along the filament shows a single-peak 9 fs pulse with a flat spectral phase at the optimum compression distance.
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