Optical: systems and elements – Optical modulator – Light wave temporal modulation
Patent
1990-02-22
1992-04-14
Hille, Rolf
Optical: systems and elements
Optical modulator
Light wave temporal modulation
359246, 359250, G02F 103, G02F 107
Patent
active
051053020
ABSTRACT:
A spatial light modulator is disclosed, in which a low dark resistance single-crystal plate is used which is formed of Bi.sub.12 MO.sub.20 (where M is Si, Ge or Ti) or similar type crystal, doped with phosphorus (P) in the range of 0.03.ltoreq.P.ltoreq.0.2 in atomic percentage to provide a dark resistivity far lower than that of an undoped crystal, and a high dark resistance layer, which is of the same crystal structure as that of the single-crystal plate and lattice-matched therewith and has photoconductivity, electro-optic effect and a high dark resistivity, is provided on the light incident side of the single-crystal plate. A tapered low dark resistance single-crystal plate may be used which is formed of Bi.sub.12 MO.sub.20 (where M=Si, Ge, or Ti) or similar sillenite type crystal, doped with phosphorus (P) in the range of 0.03.ltoreq.P.ltoreq.0.2 in atomic percentage to provide a dark resistivity far lower than that of a phosphorus-free crystal, and a high dark resistance layer, which has the same crystal structure as that of the tapered single-crystal plate and produces photoconductivity and the electro-optic effect and a high dark resistivity, is provided on the light incident side of the tapered single-crystal plate, whereby the image write sensitivity and resolution can be made uniform throughout the device.
REFERENCES:
patent: 3566130 (1971-02-01), Woburn et al.
Mimura Yoshinori
Nagao Yasuyuki
Burns Robert E.
Hille Rolf
Kokusai Denshin Denwa Kabushiki Kaisha
Limanek Robert P.
Lobato Emmanuel K.
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