An ultrafast electron microscope gun driven by two-photon photoemission from a nanotip cathode
Journal Article
·
· Journal of Applied Physics
- 4th Physical Institute, Solids and Nanostructures, University of Göttingen, Göttingen 37077 (Germany)
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.
- OSTI ID:
- 22492884
- Journal Information:
- Journal of Applied Physics, Vol. 118, Issue 17; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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