Abstract
X-ray radiation from laser wakefield accelerated (LWFA) electrons provides a collimated broadband femtosecond x-ray source with micron-scale source size. However, the photon flux is still inadequate for a range of applications. By interaction of LWFA relativistic electrons with the second and the third harmonic of the laser driving the wakefield, we report more than an order of magnitude enhancement of photon flux emitted by the electrons undergoing betatron oscillations resonant with the harmonics. This phenomenon is demonstrated with analytical and numerical models, as well as particle-in-cell simulations.
Highlights
Laser wakefield acceleration (LWFA) has received considerable attention since its conception [1]
By interaction of laser wakefield accelerated (LWFA) relativistic electrons with the second and the third harmonic of the laser driving the wakefield, we report more than an order of magnitude enhancement of photon flux emitted by the electrons undergoing betatron oscillations resonant with the harmonics
We show that the presence of the second harmonic (SH) and third harmonic (TH) of the fundamental laser frequency copropagating with the relativistic electrons enhance the photon flux of betatron x-ray radiation by an order of magnitude
Summary
Laser wakefield acceleration (LWFA) has received considerable attention since its conception [1]. We show that the presence of the second harmonic (SH) and third harmonic (TH) of the fundamental laser frequency copropagating with the relativistic electrons enhance the photon flux of betatron x-ray radiation by an order of magnitude. This enhancement originates from nonlinear resonances in betatron oscillations induced by two laser pulses with different frequencies interacting with the electrons. This resonance results in a boost of the transverse momentum px.
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