EXPERIMENTAL MEASUREMENTS AND ANALYSIS OF RELATIVISTIC THOMSON SCATTERING PRODUCED BY INTENSE LASERS
EXPERIMENTAL MEASUREMENTS AND ANALYSIS OF RELATIVISTIC THOMSON SCATTERING PRODUCED BY INTENSE LASERS
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Date
2023
Authors
He, Calvin Z
Advisor
Hill, Wendell T.
Citation
Abstract
The viability of using relativistic Thomson scattering (RTS) as an intensity gauge of intense(I ≳ 2 × 1018 W/cm2) lasers is explored. Theory motivating measurement of the RTS second
harmonic spectrum as well as angular distribution as possible diagnostics of the laser intensity are
developed and presented. Experiments conducted at the Centro de Láseres Pulsados (CLPU) laser
facility in Salamanca, Spain measuring the second harmonic spectrum radiated along E as well
as the angular distribution along the E-k plane are described and their results summarized. We
conclude that measurements of the second harmonic spectrum provide a means for determining
the laser peak intensity via the corresponding Doppler shifted onset wavelength, provided that
the intensity is in the range of ∼ 10^18 to ∼ 10^19 W/cm^2. Measurement of the angular distribution
along the E-k plane, on the other hand, does not provide features that are useful for indicating
laser intensity. Possible paths forward in the study of RTS are discussed.