Glass ceramics based on ZnO

Compositions: ceramic – Ceramic compositions – Devitrified glass-ceramics

Reexamination Certificate

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C501S037000, C385S141000, C065S033100, C065S385000

Reexamination Certificate

active

06936555

ABSTRACT:
Disclosed is a substantially transparent glass-ceramic ceramic, and a method for making a glass-ceramic, exhibiting an aluminogallate spinel crystal phase and having a glass-ceramic composition that lies within the SiO2—Al2O3—ZnO—K2O—Ga2O3—Na2O system and particularly consisting essentially, in weight percent on an oxide basis, of 25-50% SiO2, 15-45% ZnO, 0-26% Al2O3, 0-25% K2O, 0-10% Na2O, 0-32% Ga2O3, a K2O+Na2O amount of greater than 10%, a Al2O3+Ga2O3of greater than 10%, the glass ceramic microstructure containing a crystal phase comprising at least 15%, by weight, of hexagonal ZnO crystals. Another aspect disclosed is optical element selected from the group consisting of an optical fiber, a gain or laser medium, and an amplifier component, a saturable absorber, with the element comprising a transparent glass-ceramic of the same composition and containing a crystallinity of at least about 15% by weight of hexagonal ZnO crystals.

REFERENCES:
patent: 6300262 (2001-10-01), Beall
patent: 6303527 (2001-10-01), Pinckney
patent: 6531420 (2003-03-01), Beall et al.
patent: 6632758 (2003-10-01), Beall et al.
patent: 2002/0028739 (2002-03-01), Beall et al.
patent: 67219 (1969-06-01), None
patent: WO01/28943 (2001-04-01), None
patent: WO 01/28944 (2001-04-01), None
patent: WO02/090279 (2002-11-01), None
G.H. Beall & D.A. Duke, Transparent Glass Ceramics, Journal of Material Science, 4, pp. 340-352 (1969).

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