Abstract by Brittni Pratt
Physics and Astronomy
Measurement of Nonlinear Thomson Scattering
We measure polarization-resolved nonlinear Thomson scattering from electrons in a high intensity laser focus. The weak scattering signal is distinguished from background noise using single-photon detectors and time-resolved to distinguish a prompt scattering signal from delayed noise photons. The azimuthal and longitudinal components of the fundamental, second, and third harmonics were resolved. These are the first polarization-resolved measurements of nonlinear Thomson scattering. Our measurements match theoretical results, but also show some asymmetry in the emission pattern for the third harmonic.