Journal
PHYSICAL REVIEW E
Volume 74, Issue 3, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevE.74.036406
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Our experiment shows that external focusing strongly influences the plasma density and the diameter of femtosecond Ti-sapphire laser filaments generated in air. The control of plasma filament parameters is suitable for many applications such as remote spectroscopy, laser induced electrical discharge, and femtosecond laser material interactions. The measurements of the filament showed the plasma density increases from 10(15) cm(-3) to 2x10(18) cm(-3) when the focal length decreases from 380 cm to 10 cm while the diameter of the plasma column varies from 30 mu m to 90 mu m. The experimental results are in good qualitative agreement with the results of numerical simulations.
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