Cover glass (Middle/Bottom) 27.9mm DIA x 4.1mm Fused Silica 1064nm 4kw
https://www.raytoolsusa.com/shop/40-01561-00-cover-glass-middle-bottom-27-9mm-dia-x-4-1mm-fused-silica-1064nm-4kw-2657
https://www.raytoolsusa.com/web/image/product.template/2657/image_1920?unique=b518e85
40-01561-00
RayTools Model Number: 211LCG0037
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