Fine 3D control of THz emission in air with dual femtosecond laser pre-pulses at tunnelling ionisation regime

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2FCZ______%3A_____%2F24%3AN0000056" target="_blank" >RIV/CZ______:_____/24:N0000056 - isvavai.cz</a>
Result on the web
<a href="https://www.light-am.com/article/doi/10.37188/lam.2024.030" target="_blank" >https://www.light-am.com/article/doi/10.37188/lam.2024.030</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.37188/lam.2024.030" target="_blank" >10.37188/lam.2024.030</a>

Result language
angličtina
Original language name
Fine 3D control of THz emission in air with dual femtosecond laser pre-pulses at tunnelling ionisation regime
Original language description
Emission of THz radiation from air breakdown at focused ultra-short fs-laser pulses (800 nm/35 fs) was investigated for the 3D spatio-temporal control where two pre-pulses are used before the main-pulse. The laser pulse induced air breakdown forms a ~ 120 μm-long focal volume generate shockwaves which deliver a denser air into the focal region of the main pulse for enhanced generation of THz radiation at 0.1–2.5 THz spectral window. The intensity of pre- and main-pulses was at the tunnelling ionisation intensities (1 –3) × 1016 W/cm2 and corresponded to subcritical (transparent) plasma formation in air. Polarisation analysis of THz radiation revealed that orientation of the air density gradients generated by pre-pulses and their time-position locations defined the ellipticity of the generated THz electrical field. The rotational component of electric current is the origin of THz radiation.
Czech name
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Czech description
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Publication year
2024
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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