Laser Focusing System for High Brightness Polarized Electron Source for SPLEEM

Laser Focusing System for High Brightness Polarized Electron Source for SPLEEM

For construction of a high brightness polarized electron source for SPLEEM (Spin Polarized Low Energy Electronic Microscope), a new transmission type photocathode has been developed at Nagoya Univ. In our scheme, a laser light is injected from backside of the photocathode and an electron beam is emi...

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Veröffentlicht in:AIP conference proceedings 2007-01, Vol.915 (1), p.1081-1084
Hauptverfasser: Mano, A, Yamamoto, N, Tamagaki, K, Okumi, S, Yamamoto, M, Kuwahara, M, Sakai, R, Morino, T, Utsu, A, Nakanishi, T, Ohshima, T
Format: Artikel
Sprache:eng
Schlagworte:
APERTURES
BEAM LUMINOSITY
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
ELECTRON BEAMS
ELECTRON MICROSCOPY
ELECTRON SOURCES
LASER RADIATION
MICRO AMP BEAM CURRENTS
PHOTOCATHODES
POLARIZATION
SPIN ORIENTATION
SURFACES
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Beschreibung
Zusammenfassung:For construction of a high brightness polarized electron source for SPLEEM (Spin Polarized Low Energy Electronic Microscope), a new transmission type photocathode has been developed at Nagoya Univ. In our scheme, a laser light is injected from backside of the photocathode and an electron beam is emitted forward from the surface. A high numerical aperture lens with a short focal length can focus the laser lights into a small spot of photocathode. A laser spot with a diameter of 2.2mum could be achieved by our laser system, and it contributed to realize the high beam brightness of 105A*cm-2*sr-1 or more for a total current of 5muA.
ISSN:0094-243X
1551-7616
DOI:10.1063/1.2750957