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Protvino, Russia

Barmina E.V.,RAS A.M. Prokhorov General Physics Institute | Serkov A.A.,RAS A.M. Prokhorov General Physics Institute | Stratakis E.,Foundation for Research and Technology Hellas | Stratakis E.,University of Crete | And 5 more authors.
Applied Physics A: Materials Science and Processing | Year: 2012

Laser-assisted nano-texturing of W substrates cathodes via ablation in liquid environment is experimentally realized. Two laser sources are used, either a Ti:sapphire femtosecond laser or a Nd:YAG laser with pulse duration of 350 ps. Laser exposure of W results in the formation of hemi-spherical nanostructures situated on top of periodic ripples. Nano-textured thermionic W cathode demonstrates the decrease of the efficient work function by 0.3 eV compared to pristine surface. © 2011 Springer-Verlag. Source


Barmina E.V.,RAS A.M. Prokhorov General Physics Institute | Stratakis E.,Foundation for Research and Technology Hellas | Stratakis E.,University of Crete | Barberoglou M.,Foundation for Research and Technology Hellas | And 6 more authors.
Applied Surface Science | Year: 2012

Formation of surface nanostructures on Tungsten target immersed into liquids is experimentally studied under its exposure to femtosecond laser pulses with different durations. In particular, nanotexturing of Tungsten upon its exposure to delayed femtosecond pulses is investigated. Two different types of morphological features are observed, namely periodic ripples and nanostructures. Field emission scanning electron microscopy shows that the density of nanostructures as well as their morphology depends on the time delay between pulses and reaches its maximum at 1 ps delay. Thermionic emission of nano-structured W cathode is investigated. The work function of nanostructured W surface is measured to be 0.3 eV lower than that of the pristine surface. © 2012 Elsevier B.V. All rights reserved. Source

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