Influence of the electron density on the characteristics of terahertz waves generated under laser–cluster interaction

Journal Article · Thu Dec 15 04:00:00 EST 2016 · Plasma Physics Reports

DOI:https://doi.org/10.1134/S1063780X16120059· OSTI ID:22612603

A theory of generation of terahertz radiation under laser–cluster interaction, developed earlier for an overdense cluster plasma [A. A. Frolov, Plasma Phys. Rep. 42. 637 (2016)], is generalized for the case of arbitrary electron density. The spectral composition of radiation is shown to substantially depend on the density of free electrons in the cluster. For an underdense cluster plasma, there is a sharp peak in the terahertz spectrum at the frequency of the quadrupole mode of a plasma sphere. As the electron density increases to supercritical values, this spectral line vanishes and a broad maximum at the frequency comparable with the reciprocal of the laser pulse duration appears in the spectrum. The dependence of the total energy of terahertz radiation on the density of free electrons is analyzed. The radiation yield is shown to increase significantly under resonance conditions, when the laser frequency is close to the eigenfrequency of the dipole or quadrupole mode of a plasma sphere.

• OSTI ID: 22612603
• Journal Information: Plasma Physics Reports, Journal Name: Plasma Physics Reports Journal Issue: 12 Vol. 42; ISSN PPHREM; ISSN 1063-780X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
DIPOLES
EIGENFREQUENCY
ELECTRON DENSITY
INTERACTIONS
LASERS
PLASMA
PULSES
QUADRUPOLES
RESONANCE
SPECTRA
SPHERES
THZ RANGE