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Title: An ultrafast electron microscope gun driven by two-photon photoemission from a nanotip cathode

We experimentally and numerically investigate the performance of an advanced ultrafast electron source, based on two-photon photoemission from a tungsten needle cathode incorporated in an electron microscope gun geometry. Emission properties are characterized as a function of the electrostatic gun settings, and operating conditions leading to laser-triggered electron beams of very low emittance (below 20 nm mrad) are identified. The results highlight the excellent suitability of optically driven nano-cathodes for the further development of ultrafast transmission electron microscopy.
Authors:
; ; ;  [1]
  1. 4th Physical Institute, Solids and Nanostructures, University of Göttingen, Göttingen 37077 (Germany)
Publication Date:
OSTI Identifier:
22492884
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 118; Journal Issue: 17; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CATHODES; ELECTRON BEAMS; ELECTRON MICROSCOPES; ELECTRON SOURCES; GEOMETRY; LASERS; PERFORMANCE; PHOTOEMISSION; PHOTONS; TRANSMISSION ELECTRON MICROSCOPY; TUNGSTEN