Clear fused quartz for quartz wafers
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 absorption at 245 nm and no appreciable absorption at 2.73 micrometers due
to hydroxyl ions. Due to limited availability of this material, in many applications, Fused Silica can be substituted. The main differences are that Fused Quartz has much lower OH content (>100ppm) and Fused Silica transmits better in the UV range.
Fused Quartz Wafers and Substrates
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