Process for preparation of fluorophosphate optical glass

Details Process for preparation of fluorophosphate optical glass Process for preparation of fluorophosphate optical glass

1989-07-05

1990-04-10

Schor, Kenneth M.

Glass manufacturing

Processes

Forming product or preform from molten glass

65134, 65136, 501 44, C03B 1902, C03B 500, C03C 3247

Patent

active

049157213

ABSTRACT:
Optical fluorophosphate glasses based on Ba(PO.sub.3).sub.2, Al(PO.sub.3).sub.3, alkaline earth metal fluorides and AlF.sub.3 are described which have a refractive index n.sub.e between 1.47 and 1.50, an Abbe-value .nu..sub.e between 85 and 80 and a positive anomalous partial dispersion value .DELTA..nu..sub.e between +17 and +22. They comprise (in wt.-%) 0.5-3 Mg, 8-10 Ca, 12-20 Sr, 9-12 Ba, 7-9 Al, 5-9 P, 8-12 O and 35-38 F. Ti, Na, K and H may additionally be present. The improved physico-chemical parameters (expansion coefficient, glass transition temperature, density, Knoop-hardness) and the transmission characteristics are given, and a process for producing these optical glasses is described.

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