Single-crystal – oriented-crystal – and epitaxy growth processes; – Processes of growth with a subsequent step acting on the...
Reexamination Certificate
2006-04-25
2006-04-25
Kunemund, Robert (Department: 1722)
Single-crystal, oriented-crystal, and epitaxy growth processes;
Processes of growth with a subsequent step acting on the...
C117S081000, C117S082000, C117S083000, C117S942000, C117S940000
Reexamination Certificate
active
07033433
ABSTRACT:
The invention is directed to method of preparing metal fluoride single crystals and particularly to crystals where the metal is calcium, barium, magnesium or strontium, or a mixture thereof. The invention uses a decreasing fast cooling profile and an increasing slow cooling profile for the hot zone and the cold zone, respectively, after crystal formation during cooling from melt temperatures to a first temperature. A substantially constant cooling rate is then applied to the both zones during cooling from the first temperature to a final temperature, usually room temperature. It has been found that the substantially constant cooling rate during the annealing process results in crystals having improved homogeneity and birefringence.
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Li Qiao
Rosch William R.
Schermerhorn Paul M.
Corning Incorporated
Douglas Walter M.
Kunemund Robert
Song Matthew J.
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