Characteristics of quasi-unipolar electromagnetic pulses formed in the interaction of high-power laser pulses with nanoscale targets

A new method is suggested for generating quasi-unipolar electromagnetic IR and terahertz pulses. The method is based on synchronous acceleration of electrons combined to a dense bunch with a charge of up to several tens nanocoulombs, which are forced out from a nanoscale target under an action of a...

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Bibliographic Details
Published in:Quantum electronics (Woodbury, N.Y.) N.Y.), 2019-08, Vol.49 (8), p.788-795
Main Authors: Kulagin, V.V., Kornienko, V.N., Cherepenin, V.A., Gupta, D.N., Suk, H.
Format: Article
Language:English
Subjects:
Acceleration
Amplitudes
BEAMS
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
Computer simulation
COMPUTERIZED SIMULATION
ELECTROMAGNETIC PULSES
Electromagnetic radiation
electron acceleration by laser pulses
ELECTRONS
generation of terahertz and IR radiation
High power lasers
interaction of high-power laser pulses with matter
Laser beams
LASER RADIATION
LASERS
nanoscale targets
NANOSCIENCE AND NANOTECHNOLOGY
NANOSTRUCTURES
NUMERICAL ANALYSIS
Pulse propagation
REFLECTION
THZ RANGE
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Summary:A new method is suggested for generating quasi-unipolar electromagnetic IR and terahertz pulses. The method is based on synchronous acceleration of electrons combined to a dense bunch with a charge of up to several tens nanocoulombs, which are forced out from a nanoscale target under an action of a high-power, sharp-leading edge laser pulse. The electromagnetic bunch moving in a field of laser radiation can generate high-power electromagnetic pulses with various spectral composition including terahertz and IR ranges. A physical mechanism underlying the formation of generated quasi-unipolar pulses of electromagnetic radiation is determined and numerically studied. The pulse characteristics are found by numerical simulation, such as amplitude and duration dependences on the angle between the pulse propagation direction and laser beam axis. It is established that in modern laser installations, the amplitudes of quasi-unipolar pulses may reach relativistic values. Reflection of a unipolar pulse from an ideally reflecting surface is numerically analysed. It is shown that the pulse retains its unipolar profile in this case.
ISSN:1063-7818
1468-4799
DOI:10.1070/QEL16929