Quartzfenster

Quartzfenster are windows manufactured from fused quartz (silica) or quartz glass, used to seal optical or scientific instruments while transmitting light. They are typically flat or shaped as plano-convex or with specialized geometries and are manufactured in thicknesses ranging from a few millimeters to several centimeters. The term encompasses windows designed for vacuum or inert-gas environments as well as light-transmitting barriers in optical systems.

Fused quartz provides broad spectral transmission from the ultraviolet through the visible to the near infrared, high chemical resistance, and a low coefficient of thermal expansion. These properties, together with high laser damage thresholds in some configurations, make quartzfenster suitable for demanding environments. However, like other glasses, they are brittle, and surface quality and purity strongly influence UV transmission and scattering. Anti-reflection coatings are commonly applied to improve throughput at specific wavelengths.

Manufacture typically involves sourcing high-purity silica, melting and refining to fused quartz, precision cutting and polishing, then edge finishing and mounting with compatible seals for vacuum or pressure systems. Some windows are coated on one or both sides, sometimes with protective layers to resist contamination or scratches.

Applications span ultraviolet spectroscopy, laser systems, semiconductor processing equipment, high-temperature furnaces, chemical reactors, and space or aerospace instrumentation. They are chosen when chemical inertness, high-temperature resistance, and broad spectral transmission are required.

Handling and maintenance emphasize cleanliness, protection from scratches, and avoidance of thermal shock. Cleaning usually follows standard optics practice, using gentle solvents and lint-free wipes, and damaged windows are typically replaced due to the risk of fracture.