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• W2895521723 abstract "The plasma arising due to the propagation of a filamenting ultrafast laser pulse in air contains currents driven by the pulse that generate radiated electromagnetic fields. We report absolutely calibrated measurements of the frequency spectrum of microwaves radiated by the filament plasma from 2-40 GHz. The emission pattern of the electric field spectrum is mapped as a function of air pressure from atmosphere to 0.5 Torr. For fixed laser pulse energy, duration, and focal geometry, we observe that decreasing the air pressure by a factor of approximately 103 increases the amplitude of the electric field waveform by a factor of about 40. As the air pressure decreases, the lower frequency components (<10 GHz) increase in amplitude faster than those at higher frequencies (>20 GHz). To the best of our knowledge, this behavior has not been observed before, is not predicted by existing theory, and implies the existence of a radiation mechanism in the plasma distinct from that which emits at terahertz frequencies." @default.
• W2895521723 created "2018-10-12" @default.
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• W2895521723 date "2018-10-08" @default.
• W2895521723 modified "2023-10-12" @default.
• W2895521723 title "Gas pressure dependence of microwave pulses generated by laser-produced filament plasmas" @default.
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• W2895521723 doi "https://doi.org/10.1364/ol.43.004953" @default.
• W2895521723 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/30320792" @default.
• W2895521723 hasPublicationYear "2018" @default.
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