compact electron gun with a mikrospitzen - electron source and electron gun with such a gepumpter halbleiterlaser.

摘要

PCT No. PCT/FR93/00353 Sec. 371 Date Dec. 9, 1993 Sec. 102(e) Date Dec. 9, 1993 PCT Filed Apr. 8, 1993 PCT Pub. No. WO93/21646 PCT Pub. Date Oct. 28, 1993.Compact electron gun having a microdot electron source and a semiconductor laser using said gun for electronic pumping. A compact electron gun is provided having a microdot electron emitting source (2), an anode (8) spaced from the microdots, means (16) for applying a high voltage to the and, array (10) of electrodes distributed around the bean emitted by the source for the strip focussing thereof onto the anode. The array also serves as an electrostatic screen for the source with respect to the high voltage of the array. The array is positioned between the source and the anode and has at least two pairs of electrodes (18, 18b, 20a, 20b) of different dimensions which are raised to respectively positive and negative voltages. The positive and the negative voltages produce a weak electrostatic field between the source and the electrode array and a strong electrostatic field between the electrode array and the anode. The electron gun also has means for applying a medium voltage to the electrode array and means for applying an appropriate voltage to the microdots.