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laser filament

Laser and Particle Beams (1)

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Transition-Cherenkov radiation of terahertz generated by super-luminous ionization front in femtosecond laser filament
Guang-Yue Hu, Baifei Shen, An-Le Lei, Ru-Xin Li, Zhi-Zhan Xu
Journal:

Laser and Particle Beams / Volume 28 / Issue 3 / September 2010

Published online by Cambridge University Press:

20 July 2010, pp. 399-407
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Super-luminous ionization front achieved by using axicon as focus lens is proposed to improve the transition-Cherenkov radiation of terahertz emitted from a femtosecond laser filament in air. Benefitted from the better coherent superposition of radiation electric field generated by dipole-like electron current behind the ionization front, the terahertz radiation in far zone is enhanced by one order when the velocity of ionization front exceeds the light speed. Moreover, the radiation spectrum extends toward high frequency and covers the entire terahertz gap.