| 摘要 |
PCT No. PCT/US86/01340 Sec. 371 Date Jan. 30, 1987 Sec. 102(e) Date Jan. 30, 1987 PCT Filed Jun. 20, 1986 PCT Pub. No. WO87/00341 PCT Pub. Date Jan. 15, 1987.An optical recording device includes a crystal selected from the group of alkali metal halides or alkali-earth halides and is doped with an alkali metal dopant and negative hydride ions to form a doped crystal. The doped crystal is formed to have a hydride light absorption band centered about a predetermined frequency and a color center light absorption band centered about another predetermined frequency. The doped crystal exhibits two switching states with the first state having a predetermined light absorbance level in the hydride band and a relative low light absorbance level in the color center band relative to the other state and a second state having generally the same absorbance level in the hydride band and a relatively high light absorbance level in the color center band relative to the first state. The doped crystal is repeatedly switchable between the states by the irradiation of switching light of a selected intensity in the hydride band to switch the state of the doped crystal from the first state to the second state and by the irradiation of switching light of a selected intensity in the color center band to switch the state of the doped crystal from the second state to the first state. Multi-layered devices employing different doped crystal layers may be employed to vertically store additional bits of information. |
