Abstract: An electron-beam-pumped laser includes a cathode ray tube containing a laser crystal, an electron gun for producing an electron beam including a multi-element focusing electrode layer on an inner surface of the tube for effecting focusing of the beam on the laser crystal, and a multi-element deflection electrode layer on an inner surface of the tube for effecting scanning of the beam across the laser crystal. The laser crystal is disposed on a metal heat-conductive support which is adapted for accurately positioning the laser crystal in closely spaced relationship with respect to the electron gun and to a laser light emitting window of the tube.

Abstract: An electron-optical device comprising a cathode ray tube with an envelope comprising an electron gun for producing an electron beam, whose inner surface carries a multi-element layer electrode such as a helical structure formed from a high-ohmic resistance material, which structure constitutes a focusing lens. A deflection system is used for moving the focused electron beam across a laser crystal arranged in the tube. Due to the laser action of the crystal, a scanning laser is realized. The laser light leaves a window in the tube envelope. The window extends at an angle between 20.degree. and 60.degree. to the longitudinal axis of the tube which is parallel to the electron beam incident on the laser crystal. Used in, inter alia, projection tubes and electron beam-pumped lasers (for example, scanning lasers).

Abstract: An electron-optical display device includes a cathode ray tube having a cylindrical neck of very small external diameter, such as .ltoreq.15 mm, the inner surface of the neck having thereon a helical multi-element layer electrode formed of a high ohmic resistance material, which electrode constitutes a focusing lens. In combination with a deflection system of correspondingly small diameter and operating at high scanning frequencies, this makes it possible to use a very small scanning spot of high luminance and without requiring excessive deflection energy. The device may be used as a television image projection tube or as an electron beam pumped scanning laser.