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VOLUME 106 (2017) | ISSUE 11 | PAGE 675
Backward terahertz radiation from the two-color femtosecond laser filament
Abstract
We report the first experimental observation of backward terahertz emission from the two-color laser induced plasma filament in air. The ratio of measured forward-to-backward terahertz radiation is \sim 25/1. This result agrees with numerical simulations based on interferometric model assuming 0.3 mm long plasma source.