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  • 1.
    Smijesh, N.
    et al.
    Umeå University, Faculty of Science and Technology, Department of Physics.
    Zhang, X.
    Umeå University, Faculty of Science and Technology, Department of Physics.
    Fischer, Peter
    Umeå University, Faculty of Science and Technology, Department of Physics.
    Muschet, Alexander
    Umeå University, Faculty of Science and Technology, Department of Physics.
    Salh, Roushdey
    Umeå University, Faculty of Science and Technology, Department of Physics.
    Tajalli, A.
    Morgner, U.
    Veisz, Laszlo
    Umeå University, Faculty of Science and Technology, Department of Physics.
    Contrast improvement of sub-4 fs laser pulses using nonlinear elliptical polarization rotation2019In: Optics Letters, ISSN 0146-9592, E-ISSN 1539-4794, Vol. 44, no 16, p. 4028-4031Article in journal (Refereed)
    Abstract [en]

    Temporal-intensity contrast is crucial in intense laser-matter interaction to circumvent the undesirable expansion of steep high-density plasma prior to the interaction with the main pulse. Nonlinear elliptical polarization rotation in an argon filled hollow-core fiber is used here for cleaning pedestals/satellite pulses of a chirped-pulse-amplifier based Ti: Sapphire laser. This source provides similar to 35 mu J energy and sub-4-fs duration, and the process has >50% internal efficiency, more than the most commonly used pulse cleaning methods. Further, the contrast is improved by 3 orders of magnitude when measured after amplifying the pulses to 16 TW using non-collinear optical parametric chirped pulse amplification with a prospect to even further enhancement.

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