Photoemission pulsed source of wide-band directional electromagnetic radiation

Lazarev, Yu. N.; Petrov, P. V.; Syrtsova, Yu. G.

doi:10.1134/1.1826194

Cited by 7 publications

(4 citation statements)

References 4 publications

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“…Basov et al demonstrated that the velocity of propagation of a powerful light pulse in an active medium can exceed the speed of light in vac uum by many times, which is caused by the transfer of the maximum of the pulse to the region of its leading edge [216]. (10) In 1972, Ginzburg and Bolotovskii considered the motion of a so called superluminal light spot and showed that such a spot from an electron beam will cause Vavilov-Cherenkov radiation in vacuum [85,86] (this effect was obtained in 2004 using γ radiation from a target exposed to the action of a laser pulse [234,235]). These spots can also excite generation of microwave radiation in closed waveguides (see paper by L.A. Rivlin published in 1956 [230]; a more detailed theory was presented in 1979 in paper by G.I.…”

Section: Basic Results Of This Review Can Be Formulated As Followsmentioning

confidence: 99%

“…As early as in 1972, a powerful generator of broad band directed electromagnetic radiation was proposed [86,87,232] (see also [88,89,233]) and, in 2004, was built [234][235][236], the operating principle of which is based on the excitation of Vavilov-Cherenkov radia tion by means of a virtual electric charge, which, in turn, arises under the action of an X ray spot moving with a superluminal velocity. This X ray spot is formed upon irradiation of a target with a high power short laser pulse [234][235][236].…”

Section: Generation Of Electromagnetic Radiation With Superluminal LImentioning

confidence: 99%

“…This X ray spot is formed upon irradiation of a target with a high power short laser pulse [234][235][236].…”

Section: Generation Of Electromagnetic Radiation With Superluminal LImentioning

confidence: 99%

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Superluminal motion (review)

Malykin

Romanets

2012

Opt. Spectrosc.

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Prior to the development of Special Relativity, no restrictions were imposed on the velocity of the motion of particles and material bodies, as well as on energy transfer and signal propagation. At the end of the 19th century and the beginning of the 20th century, it was shown that a charge that moves at a velocity faster than the speed of light in an optical medium, in particular, in vacuum, gives rise to impact radiation, which later was termed the Vavilov-Cherenkov radiation. Shortly after the development of Special Relativity, some researchers considered the possibility of superluminal motion. In 1923, the Soviet physicist L.Ya. Strum sug gested the existence of tachyons, which, however, have not been discovered yet. Superluminal motions can occur only for images, e.g., for so called "light spots," which were considered in 1972 by V.L. Ginzburg and B.M. Bolotovskii. These spots can move with a superluminal phase velocity but are incapable of transferring energy and information. Nevertheless, these light spots may induce quite real generation of microwave radi ation in closed waveguides and create the Vavilov-Cherenkov radiation in vacuum. In this work, we consider various paradoxes, illusions, and artifacts associated with superluminal motion.

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Section: Basic Results Of This Review Can Be Formulated As Followsmentioning

confidence: 99%

Section: Generation Of Electromagnetic Radiation With Superluminal LImentioning

confidence: 99%

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Superluminal motion (review)

Malykin

Romanets

2012

Opt. Spectrosc.

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“…The low cost of generating a static electric field power supplies for amplification of output EMR power compared to expensive laser systems make these sources extremely promising for generating ultrawideband electromagnetic pulses. By changing the parameters of the emitting element (diode), choosing different light sources and different power sources for the diode, it is possible to obtain a wide range of devices that generate an electromagnetic pulse in the microwave range [ 24 ]. In the case of using an anode opaque to electrons, it becomes possible to shorten the tail of the EMR pulse [ 25 ].…”

Section: Introductionmentioning

confidence: 99%

Pulsed THz radiation under ultrafast optical discharge of vacuum photodiode

Ushakov,

Mamaeva,

Seleznev

et al. 2024

Front. Optoelectron.

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In this paper, we first present an experimental demonstration of terahertz radiation pulse generation with energy up to 5 pJ under the electron emission during ultrafast optical discharge of a vacuum photodiode. We use a femtosecond optical excitation of metallic copper photocathode for the generation of ultrashort electron bunch and up to 45 kV/cm external electric field for the photo-emitted electron acceleration. Measurements of terahertz pulses energy as a function of emitted charge density, incidence angle of optical radiation and applied electric field have been provided. Spectral and polarization characteristics of generated terahertz pulses have also been studied. The proposed semi-analytical model and simulations in COMSOL Multiphysics prove the experimental data and allow for the optimization of experimental conditions aimed at flexible control of radiation parameters. Graphical Abstract

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