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Author: Penka, D. ×

Publications Search Results

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  • Publication
    Radiation tolerant frequency comb fiber laser for space applications
    ( 2022)
    Lezius, M.
    ;
    Penka, D.
    ;
    Melin, G.
    ;
    Robin, T.
    ;
    Cadier, B.
    ;
    Kuhnhenn, Jochen
    ;
    Weinand, Udo
    ;
    Holzwarth, R.
    Advanced radiation tolerant Erbium doped fibers have been developed surviving an accumulated dose of 1 kGy∗. Femtosecond fiber lasers and amplifiers manufactured from such fibers have been packaged and irradiated under active operation to test for accelerated ageing with dose rates up to 10 mGy/s using a Cobalt 60 source. The laser output power degraded by about 11% after exposure of a dose of 1 kGy. Compared to conventional Erbium fiber lasers this represents a significant improvement in radiation tolerance.
  • Publication
    Light scattering characterization of optical components for space applications
    ( 2017)
    Hauptvogel, M.
    ;
    Trost, M.
    ;
    Costille, A.
    ;
    Penka, D.
    ;
    Zeitner, U.D.
    ;
    Schröder, S.
    ;
    Duparré, A.
    Light scattering can critically affect the performance of high-end optical systems. For instance, unavoidable but small residual imperfections of optical components such as surface or coating roughness, bulk inhomogeneities, and defects as well as the interaction of light with apertures and baffles give rise to light scattering propagating through the optical system which degrades the imaging quality and leads to a loss of the optical throughput.