Author: Almási, G.
Paper Title Page
MOP071 Carrier-Envelope-Phase Stable Linearly and Circularly Polarized Attosecond Pulse Sources 205
  • Z. Tibai, G. Almási, Zs. Csiha-Nagy, J.A. Fülöp, J. Hebling
    University of Pecs, Pécs, Hungary
  • J.A. Fülöp, Gy. Tóth
    MTA-PTE High-Field Terahertz Research Group, Pecs, Hungary
  Recently, we proposed a robust method for producing waveform-controlled attosecond pulses in the EUV spectral range.* In our scheme the relativistic electron beam, provided by a LINAC, is sent through a modulator undulator where a TW-power laser beam is superimposed on it in order to generate nanobunches. The nanobunched electron beam passes through a single- or few-period radiator undulator (RU). The waveform of the generated attosecond pulses closely resembles the longitudinal distribution of the magnetic field. According to our calculations, at 20 nm (60 nm) wavelength carrier-envelope-phase (CEP) stable pulses with 23 nJ (80 nJ) energy, 80 as (240 as) duration, and 31 mrad (13 mrad) CEP fluctuation (standard deviation) can be achieved at K=0.5. More than 500 nJ energy is predicted at longer wavelengths and larger K. The energy fluctuation of the EUV pulse is 2.5 times higher than that of the laser. By using a helical RU, even circularly polarized attosecond pulses with 30/300 nJ energy can be generated, depending on the wavelength. To the best of our knowledge, no other presently available technique enables the generation of arbitrary-waveform, CEP-controlled attosecond pulses. The predicted pulse energies are sufficiently high to be used as pump pulses in attosecond pump-probe measurements.
* Z. Tibai et al., Phys. Rev. Lett. 113, 104801 (2014).
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