Quantum 2025 – scientific programme
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MON: Monday Contributed Sessions
MON 16: Quantum Spectroscopy
MON 16.7: Talk
Monday, September 8, 2025, 18:00–18:15, ZHG004
Control of laser-assisted radiative recombination beyond the dipole approximation — Deeksha Kanti1, •Mateusz Majczak1, Jerzy Kamiński1, Liang-You Peng2, and Katarzyna Krajewska1 — 1Institute of Theoretical Physics, Faculty of Physics, University of Warsaw, Warsaw, 02-093, Poland — 2State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics, School of Physics, Peking University, Beijing, 100871, China
We present a comprehensive theoretical description of laser-assisted radiative recombination (LARR) in the presence of short laser pulses, that accounts for nondipole corrections of the leading order in 1/c. They are derived systematically by the relativistic reduction, enabling us to follow the origin of various nondipole contributions. As it follows from our numerical analysis, the most important of them originates from the electron recoil off the laser pulse. We recognize that it results in extension of the LARR high-energy plateau and is a cause of an asymmetry of energy distributions of generated radiation with respect to the polar angle of the recombining electron. As we show, the remaining nondipole corrections of the leading order in 1/c turn out to be less significant.
In addition, we analyze ways to control the LARR radiation using external laser pulses. Despite the aforementioned nondipole effects which arise entirely from the presence of the laser field, we investigate the possibility of manipulating the intensity of the cutoff portion of LARR by chirping the accompanying laser pulse.
Keywords: Laser-assisted recombination; Non-dipole effects