3 results match your criteria: "Scottish Universities Physics Alliance and University of Strathclyde[Affiliation]"
High-Energy, Short-Duration Bursts of Coherent Terahertz Radiation from an Embedded Plasma Dipole.
Sci Rep
January 2018
School of Natural Science, UNIST, 50 UNIST-gil, Ulju-gun, Ulsan, 44919, Korea.
Article Synopsis
- Electrons in plasma can emit radiation during oscillations at a specific frequency, leading to interesting interactions between electrostatic waves and emitted electromagnetic waves.
- Despite known broadband emissions in non-uniform plasma, the reasons behind the narrowband emissions, like those seen in solar bursts, remain unclear.
- This study explains how localized oscillations can be created by trapping electrons with colliding laser pulses, resulting in powerful bursts of terahertz radiation ideal for high-intensity applications.
An ultra-high gain and efficient amplifier based on Raman amplification in plasma.
Sci Rep
May 2017
Department of Physics, Scottish Universities Physics Alliance and University of Strathclyde, Department of Physics, Glasgow, G4 0NG, United Kingdom.
Raman amplification arising from the excitation of a density echelon in plasma could lead to amplifiers that significantly exceed current power limits of conventional laser media. Here we show that 1-100 J pump pulses can amplify picojoule seed pulses to nearly joule level. The extremely high gain also leads to significant amplification of backscattered radiation from "noise", arising from stochastic plasma fluctuations that competes with externally injected seed pulses, which are amplified to similar levels at the highest pump energies.
View Article and Find Full Text PDFIncreased impedance near cut-off in plasma-like media leading to emission of high-power, narrow-bandwidth radiation.
Sci Rep
January 2017
Scottish Universities Physics Alliance and University of Strathclyde, Glasgow G4 0NG, United Kingdom.
Ultra-intense, narrow-bandwidth, electromagnetic pulses have become important tools for exploring the characteristics of matter. Modern tuneable high-power light sources, such as free-electron lasers and vacuum tubes, rely on bunching of relativistic or near-relativistic electrons in vacuum. Here we present a fundamentally different method for producing narrow-bandwidth radiation from a broad spectral bandwidth current source, which takes advantage of the inflated radiation impedance close to cut-off in a medium with a plasma-like permittivity.
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