Formation of an electron beam with a duration shorter than 100 fs during photoemission of electrons by femtosecond laser pulses |
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Authors: | B N Mironov S A Aseev V G Minogin S V Chekalin |
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Institution: | (1) Institute of Spectroscopy, Russian Academy of Sciences, Troitsk, Moscow region, 142190, Russia |
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Abstract: | Irradiation of a thin metal target by 38-fs laser pulses at a wavelength of 800 nm is shown to generate a beam of photoelectrons that contains a component whose duration is shorter than 100 fs. The ensemble of photoelectrons is formed by photoemission of a gold film about 10 nm thick sputtered on the base of a prism made of fused silica. The laser beam irradiates a dielectric-metal interface and propagates inside the prism at an angle of 45° to a normal to the interface. The photoelectron beam is formed by accelerating photoelectrons in a spatially inhomogeneous electrostatic potential. The ultrashort component of the photoelectron beam is found to be formed under the action of a ponderomotive potential. It is shown that the ultrashort electron component can be separated from the remaining part of the photoelectron beam with the help of an inhomogeneous electrostatic field. |
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