https://doi.org/10.1140/epjd/s10053-021-00314-1
Regular Article – Ultraintense and Ultrashort Laser Fields
Optical gain in a free-electron laser with laser wiggler in the presence of a magnetized ion-channel
Department of Physics, University of Guilan, 41335-1914, Rasht, Iran
Received:
27
September
2021
Accepted:
20
November
2021
Published online:
7
December
2021
In this paper, we analytically investigated the optical gain in a free-electron laser (FEL) with a laser wiggler in the presence of a magnetized ion-channel. Electron trajectories, energy exchanges and optical gain of the FEL in the presence of magnetized ion-channel have been calculated. Laser wiggler due to its very short wiggler wavelength (in the micrometer range) provides both shorter output wavelength (in the X-ray range) and higher optical gain relative to the common magneto-static (helical or planar) wigglers. The results indicated that there are three groups of orbits (G.I.O, G.II.O, and G.III.O) in the presence of a magnetized ion-channel, whereas only two groups were found in the unmagnetized case. Further results revealed a strong laser gain due to the presence of G.II.O in the magnetized ion-channel, while this significant optical gain was not observed in the unmagnetized ion-channel. The most significant characteristic of our scheme is its output wavelength scalability by controlling the ion-channel and axial magnetic frequencies, as well as laser wiggler parameters.
© The Author(s), under exclusive licence to EDP Sciences, SIF and Springer-Verlag GmbH Germany, part of Springer Nature 2021
