2020/09/30 by A. Di Piazza · 30 citations
Earth and Planetary Sciences · Medicine · Physics and Astronomy · #Compton scattering #High-pressure geophysics and materials #Laser-Matter Interactions and Applications #Laser-Plasma Interactions and Diagnostics #Medicine #Nonlinear system #Nuclear physics #Optics #Physics #Quantum mechanics #Radiology #Scattering #Transverse plane #hep-ph
paper · pdf · doi:10.1103/physreva.103.012215
published in Physical Review A 103(1) (American Physical Society) · 23 pages
arxiv created 2021/01/20 · openalex publication_date 2021/01/20 · arxiv updated 2021/01/27 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
The process of emission of electromagnetic radiation does not occur instantaneously, but is ``formed'' over a finite time known as the radiation formation time. In the ultrarelativistic regime, the corresponding (longitudinal) formation length is given by the formation time times the speed of light and controls several features of radiation. Here, we elucidate the importance of the transverse formation length (TFL) by investigating nonlinear Compton scattering by an electron initially counterpropagating with respect to a flying focus laser beam. The TFL is related to the transverse size of the radiation formation ``volume'' and, unlike the longitudinal formation length, has a quantum origin. Since the TFL is typically of the order of the Compton wavelength, where any laser field can be assumed to be approximately uniform, related quantum interference effects have been ignored. However, we show analytically that if the focus in a flying focus beam with nL\ensuremath≫1 cycles moves at the speed of light and backwards with respect to the beam propagation direction, the effects of the TFL undergo a large enhancement proportional to nL and may substantially alter the differential emission probability for feasible flying focus pulses.