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Acoustic signals generated by filamentation of TW laser pulses in water are characterized experimentally and numerically revealing a strong influence of the input pulse duration on the shape of the acoustic signal.
Interaction between a large number of conventional infrared filaments in air leads to the emergence over meter long distance of plasma channels one order of magnitude denser than standard filaments. Simulations reproduce well these features.
Propagation of femtosecond pulses at 800 and 400 nm is studied in water. Acoustic signals generated with MW to TW laser power are characterized, showing a directed and broadband emission in the band 0–20 MHz.
We present results of an experimental study aimed at producing a compact Marx generator consisting of three to six stages in series. A continuous plasma column is used to trigger simultaneously each element of the generator. This plasma channel is created by the filamentation of an intense femtosecond laser pulse (200–250 mJ, 700 fs @ 800 nm) from a Ti: Sapphire chirped pulse amplification laser chain...
The propagation of intense ultrashort laser pulses in water is affected by group velocity dispersion and nonlinear effects such as self-focusing and multiphoton absorption [1]. For a laser beam with an input peak power exceeding a few MW propagating in water, a filamentation phenomenon can occur producing a self contraction of the beam accompanied by the formation of an extended plasma channel [2]...
During propagation of intense laser pulses through atmosphere, owing to a dynamic competition between Kerr self-focusing, diffraction and ionization induced defocusing, a contracted beam of high peak intensity can be formed over long distances, provided the pulse input power exceeds a critical value (Pc ∼ 5 GW at 800 nm). During this process called filamentation [1], the pulse leaves in its wake a...
Plasma antennas, where plasma replaces metal as the conducting element, have long been known and used [1]. However, most designs use low-pressure plasmas confined inside solid dielectric vessels. We experimentally demonstrated a functional plasma antenna in air, which brings about many advantages like tunability in a large frequency range (100 MHz–1 GHz), stealth when de-activated and quick reconfiguration...
We study the guiding effect of femtosecond laser filaments on high-voltage electric discharges generated by a compact Tesla coil. Meter scale repetitive discharges are demonstrated.
We demonstrate the use of a plasma column created by femtosecond filamentation and heated by a high-voltage discharge from a Tesla coil as an effective radio-frequency emitting antenna.
We investigate the scattering of waves from a rough surface. From the analytical theory of rough surface green's function based on the extension of the diagram method of Bass, Fuks and Ito, wi.th the smoothing approximation, numerical results are presented for a sea spectrum and compared with a benchmark method by considering a one-dimensional perfectly-conducting gaussian rough surface. The effects...
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