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Abstract
Coherent transition radiation in the terahertz (THz) region with energies of sub-mJ/pulse has been demonstrated by relativistic laser-driven electron beams crossing the solid-vacuum boundary. Targets including mass-limited foils and layered metal-plastic targets are used to verify the radiation mechanism and characterize the radiation properties. Observations of THz emissions as a function of target parameters agree well with the formation-zone and diffraction model of transition radiation. Particle-in-cell simulations also well reproduce the observed characteristics of THz emissions. The present THz transition radiation enables not only a potential tabletop brilliant THz source, but also a novel noninvasive diagnostic for fast electron generation and transport in laser-plasma interactions.
Original language | English |
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Article number | 205003 |
Number of pages | 13 |
Journal | Physical Review Letters |
Volume | 116 |
DOIs | |
Publication status | Published - 20 May 2016 |
Keywords
- transition radiation
- acceleration
- laser-plasma interactions
- coherent radiation
- tetrahertz emissions
- THz radiation
- coherent transition radiation
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