| http://www.w3.org/ns/prov#value | - The materials which can be used to produce nonlinear optical media for optical memory devices of the invention may be such organic substances as glass, crystal, diamond, silicon dioxide, mica, marble, calcite, single crystal silicon, noncrystal silicon, GaAs, CdS, KDP, KTP, lithium niobate, potassium bromide, Rochelle salt, copper sulfate, calcium fluoride, graphite, tin dioxide, barium titanate,
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