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Sam Barber

As seen in: Nature
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Articles

Stable and tunable MeV \(\gamma\) -ray generation via dual-laser inverse Thomson scattering from a laser-plasma accelerator

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By Tobias M. Ostermayr, Robert Jacob, Qiang Chen, Benjamin Greenwood, Anthony Gonsalves, Kei Nakamura, Ocean Zhou, Sam Barber, Fumika Isono, Scott Thompson, James Johnson, Jay D. Hix, David Chichester, Carl Schroeder, Eric Esarey, Jeroen van Tilborg, Cameron Geddes, Hai-En Tsai, Robert Ettelbrick, Liona Fan-Chiang, Edward Seabury
| Nature Verified
Abstract Inverse Thomson scattering from laser-plasma accelerators offers a pathway to compact, tunable MeV \(\gamma\)-ray sources for reduced-dose radiography and enhanced performance in nuclear resonance fluorescence (NRF)-based isotope identification. However, photon yield and spectral quality are often limited by constraints on interaction geometry and scatter-laser tunability.
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Plasma interactions with bespoke laser pulses - Nature Photonics

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By Sam Barber
| Nature Verified
Due to dispersion, the group velocity of laser pulses propagating in plasmas slows down with increasing wavelength, which presents challenges for precision-controlled plasma interactions. Now, new techniques for spatio-temporal pulse shaping have lifted this limitation in the demonstration of short-pulse table-top soft X-ray lasers. Since the first experimental demonstration of lasers, the study of their interaction with plasmas has been the subject of considerable interest.
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