Abstract

LaB6 has been traditionally used as a thermionic electron source for electron microscopes, but has been hardly set to practical use as cold field emitter (CFE) [^1-2]. The chemical inertness, the high conductivity and the dense structure make LaB6 a good candidate as ultrafast electron source. In the present work, we study the emission properties of LaB6 nano-tip fabricated by focused ion beam milling, under static electric field (static emission) and under femtosecond laser illumination (ultrafast emission), using a 2.25μm laser at 13 MHz.

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