| 摘要 |
PURPOSE:To prevent deterioration of the optical crystal surface in the process of evacuation and improve its image storing characteristic, by coating the surface of the optical crystal storing the photoelectron emitted by the photoelectric surface with a layer of dielectric material stable in high vacuum and under high temperature. CONSTITUTION:The image from the input pattern 1 incident on the photoelectric surface 4 provided in the vacuum vessel 3 is brought to and stored on the optical crystal 8 of LiNbO3 or the like through the focusing lens system 5 and the microchannel plate 6, the refraction factor of the same is varied, and the image 11 is obtained by irradiation from the laser source 10. The optical crystal 8 then is provided on its front surface with a coating layer of an dielectric material stable in high vacuum and under high temperature formed from SiO2, CeO2, ZrO2, Al2O3, or the like, by high-frequency sputtering method in the atmosphere of (Ar+O2). Therefore, the dissipation of O2 or Li2O from the surface of the crystal 8 in the process of the evacuation leading to formation of defects in the crystal is preventd and a good image storing characteristic can be provided. |
