Optical: systems and elements – Holographic system or element – Having particular recording medium
Patent
1996-12-26
1999-05-18
Spyrou, Cassandra
Optical: systems and elements
Holographic system or element
Having particular recording medium
359 7, 359 32, G03H1/02
Patent
active
059055847
ABSTRACT:
In a hologram recording and reproducing apparatus including a hologram record element having a record unit formed by a photorefractive single crystal and a pair of electrodes provided on the record unit for applying a voltage to said record unit, and an optical system for impinging light onto an incident surface of the record unit, the record unit is made of a (100) wafer of Bi.sub.12 SiO.sub.20 or Bi.sub.12 GeO.sub.20 optical single crystal belonging to a cubic system, the light is made incident upon the (100) incident surface such that an optical axis of the incident light is inclined with respect to <100> axis of the optical single crystal by an angle .theta. of 30.degree.-60.degree.. The hologram record unit is immersed in an optically transparent and electrically insulating medium having a refractive index which differs from a refractive index of the optical single crystal by not larger than 0.50, the medium being contained in a vessel made of an optically transparent and electrically insulating material.
REFERENCES:
patent: 3652145 (1972-03-01), Thaxter
patent: 4138189 (1979-02-01), Huignard et al.
patent: 4674824 (1987-06-01), Goodman et al.
NGK Insulators Ltd.
Schuberg Darren E.
Spyrou Cassandra
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