High current and directional electron beams produced from gold photocathodes by ultrashort excimer laser pulses

Abstract

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Optical fiber-based photocathode

“…The resulting normalized emittance for the 50 lm fiber is rms ¼ 4.0 p nm. This value is on a par with state-of-the-art externally illuminated cathodes 22 and very good when compared to earlier results [23][24][25] or to the theoretical prediction made by the three-step model for photoemission. 26 The transverse coherence length of the electron bunch at the slit position can be estimated from the measured emittance and beam size using the relation 22,27 Using this equation, we obtain L x ¼ 4:1 nm.…”

Photoemission from metals covered with a nanostructured carbon film

“…1,2 The laser temporal evolution of both photoelectric and thermionic emission, their coexistence, and dependence from the laser-beam parameters give information about carrier and phonon dynamics in the solid. 3 The laserinduced photoelectric effect is also interesting for the production of intense, ultrashort, and highly directional electron beams with possible applications for accelerator injectors.…”

“…3 The laserinduced photoelectric effect is also interesting for the production of intense, ultrashort, and highly directional electron beams with possible applications for accelerator injectors. 2 Metals are widely used as photocathodes for their robustness and high-current capability. Unfortunately, their quantum efficiency ͑QE͒ is low.…”

The granulated gold-film-based semitransparent photocathodes in the visible spectrum range for femtosecond time-resolution experiments

“…This band allows exciting PE at the normal angle of incidence with respect to photocathode. The PE sensitivity is about 1 mA/W in the green spectrum range, which is several order of magnitude higher than that of the photocathode made of inactivated continuous metal films 6,7 . Inasmuch as there is no photoelectron transport to the photocathode surface, and the life-time of the plasmons for gold amounts to about a few femtoseconds 9 , the Au-granulated films activated by Cs and O can be used as the photocathodes in ultrafast processes investigation on femtosecond time scale.…”