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    • 6. 发明申请
    • OPTICAL RECORDING DEVICE
    • 光学记录装置
    • WO1987000341A1
    • 1987-01-15
    • PCT/US1986001340
    • 1986-06-20
    • SADJIAN, Harry
    • G11C11/42
    • G11B7/243G11B7/00455G11B2007/24326
    • 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 (40) centered about a predetermined frequency having a wavelength (lambda1) and a color center light absorption band (50) centered about another predetermined frequency having a wavelength (lambda2). The doped crystal exhibits two switching states with the first state having a light absorption level in the hydride band and a low light absorption level in the color center band and a second state having a light absorption level in the hydride band and a hight light absorption level in the color center band. 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 (60, 70) employing different doped crystal layers may be employed to vertically store additional bits of information.