GLASS FOR SALE

Here you will find glass for sale coming from our inventory of glass that we have accumulated from work done for previous projects such as test plates or spares that can be used for new projects.  We can generate and shape the glass to your specifications or fabricate a finished optic.  This list will be constantly changing so keep coming back as things will be sold or be added.

1. GE 124 Fused Quartz plano-plano blank 1780 mm in diameter, 128 mm thick.

     This is a plano-plano blank of GE 124 fused quartz, 1780 mm in diameter and 128 mm thick.  This blank was cut from a larger boule so all the surfaces are saw cut finish. The twin of this piece cut from the same boule was fabricated into a 1.5 m lens for use as a test optic.  A picture of the lens is shown in the 2nd item in this list. In this unfinished piece there is some damage at the edge of the blank in the area shown in the photo that extends in about 4” at the one location.  The blank can be edged down to 1500-1550 mm to clear the damage.  Other than the edge damage the blank is in excellent condition. ROC would generate the blank to a customer’s specifications for both diameter and radius of curvature, if desired.  The current weight of the blank is about 865 kg or 1900 lbs.

2.  1500 mm Diameter Lens made from GE 124 Fused Quartz.


     This lens was made from the same boule of GE 124 fused quartz as the blank shown above in Item 1. The lens is 1500 mm in diameter and has a front concave surface radius of 7236 mm (f/2.4) and a rear convex surface radius of 4000 mm.  The lens has a center thickness of 100 mm and an edge thickness of 70 mm.  A 19 mm wide flat band has been ground at the top edge of the concave surface giving a polished front surface aperture of 1462 mm.  Both sides are fully polished and spherical.  There is a 50 mm hole through the center that is used for inserting a lifting eye through the lens that bolts to a lifting plate underneath used for moving the lens. There is a notch in the edge of the lens extending across the edge that was used for alignment that is 150 mm long and extends inward 10 mm leaving a 9 mm flat in this region. It is at about the 10:00 position in the photo below. It does not extend into the polished aperture.  In the photo it can be seen that the rear surface is coated with a protective layer of contact paper as it rests on a support system.  In this setup the concave surface of the lens was being used as a test mirror in the test of another optic. An interferogram of the full aperture of the concave surface is shown here.  Either or both of the surfaces could be recut on our CNC to new radii, and/or edged down to a smaller diameter, if desired.

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