An electron emitting element including a semiconductoropto-electronic layer having a split valence band andcapable of emitting a beam of spin-polarized electrons froman emitting surface thereof upon incidence of an excitationlaser radiation upon the emitting surface, and a reflectingmirror formed on one of opposite sides of theopto-electronic layer remote from the emitting surface andcooperating with the emitting surface to effect multiplereflection therebetween of the incident laser radiation. Theemitting element may be provided with a semiconductor lightmodulator element for modulating the intensity of the laserradiation incident upon the opto-electronic layer. A lasersource may be formed integrally with the emitting elementand disposed on the side of the opto-electronic layer remotefrom the emitting surface.
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