Optical furnace

The ornamental design for an optical furnace, as shown and described.

FIG. 1 is a first perspective view of an optical furnace showing our new design.

FIG. 2 is a second perspective view of an optical furnace showing our new design.

FIG. 3 is a third perspective view of an optical furnace showing our new design.

FIG. 4 is a fourth perspective view of an optical furnace showing our new design.

FIG. 5 is a top view of an optical furnace showing our new design; and,

FIG. 6 is a bottom view of an optical furnace showing our new design.

The broken lines shown represent the portions of the optical furnace that form no part of the claimed design.

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