Fused Quartz Optical Properties
The type of manufacturing method and the raw materials used dictate the final properties of the fused quartz produced. The degree of transparency reflects the material purity. The UV cutoff ranges from about 155 to 175 nm for fused quartz, and is an indicator of material purity. In the IR range, the infrared transmission extends to approximately 4 micrometers with little absorption at 2.73 micrometers (the water band). This means that the quartz is electrically fused, rather than flame fused (or "wet" quartz).
GE Clear Fused Quartz
GE 124 clear fused quartz, for quartz wafers and substrates, is produced from silica sand by electric fusion and therefore has a UV cutoff for 1mm thickness at <160 nm, a slight absorbtion at 245 nm and no appreciable absorbtion at 2.73 micrometers due to hydroxyl ions.
Nominal Purity: 99.999 W% SiO2
Fused Quartz Wafers and Substrates
Wafer and substrates can be processed as large as 12" square or 12" diameter with almost perfect surface finish of <10/5 or 5-10 Angstroms. Many sizs available from stock ranging from .133" (3.4mm) square to 7.87" (200mm) diameter. Thicknesses range from ultra-thin < 100um to 250um, 500um, 1mm, 1.5mm, 2mm and up. Custom thicknesses and sizes also available.
