Quartz
Quartz sand is continually filled into a vertical furnace from the top. Inside, the furnace is filled with a neutral to slightly reductive inert gas to inhibit a chemical reaction of SiO2 with the crucible. The quarz sand melts on its way throu
- Transmission range: 0.2-2.5 µm
- Parallelism: 3 arcminutes
- Planarity: 1 wavelengths at 633 µm
- Surface quality: 40/20
- "c-cut": c axis is parallel to the optical axis
- Bakeable up to 120 °C (248 °F)
