Author: Hebling, J.
Paper Title Page
Laser-Plasma Accelerator Based Single-Cycle Attosecond Pulse Generation  
  • Z. Tibai, G. Almasi, J. Hebling, M.I. Mechler, A. Nagyvaradi
    University of Pecs, Pécs, Hungary
  • J.A. Fülöp, Gy. Tóth
    MTA-PTE High-Field Terahertz Research Group, Pecs, Hungary
  • A. Sharma
    ELI-ALPS, Szeged, Hungary
  A carrier-envelope-phase controlled single-cycle attosecond pulse source was proposed by us relying on a conventional linear accelerator.* Here, we demonstrate the feasibility of a related scheme, where a laser-plasma accelerator, rather than a LINAC is used. Pulses from a TW/PW-power laser are focused into a gas jet to generate a relativistic electron beam, which is then sent through a first quadrupole triplet to reduce its divergence. The reduction of the slice energy spread can be accomplished by a first chicane. The electron beam passes through a modulator undulator along with a TW laser beam (ELI-ALPS SYLOS).** Here, the interaction between the electrons, the magnetic field of the undulator, and the electromagnetic field of the laser introduces a periodic energy modulation. The electrons propagate through a second chicane which leads to the formation of a train of nanobunches. The nanobunched electron beam then moves through the radiator undulator consisting of a few periods and creates CEP-stable attosecond pulses According to our calculations, at 60 nm (100 nm) wavelength CEP stable pulses with 13 nJ (22 nJ) energy and 240 as (400 as) duration can be achieved at K=0.8.
* Z. Tibai et al., Phys. Rev. Lett. 113, 104801 (2014).
** online at for ELI-ALPS (The Scientific Case of ELI-ALPS (2015)).