| 摘要 |
A laser emission film element 32 consists of a monocrystalline zinc oxide to which is added lithium to form an impurity level having an extremely narrow energy band. The laser emission element emits red laser radiation having a wavelength of 0.695 mu m by transition of electrons between a metastable energy level formed by Vo<-> centres and a ground state formed by Li. Pumping is effected by an electron beam source 33. A resonator is formed by polished end surfaces of the film, by a half mirror at each end, or by the combination of a half mirror 35 and a grating 36 on a major surface of the film. <IMAGE> |
