Thick Precision Fused Silica Plano-Plano Optical Window

Premium thick plano-plano parallel window on high-purity fused silica (quartz) substrate – excellent surplus lab versatile precision window for laser engineers, researchers, university labs, or anyone needing reliable UV-VIS-NIR optics for transmission, or precision applications optic for high-power laser or demanding viewport applications.

Edge clearly marked “QTZ” with arrow pointing to one surface (standard notation confirming quartz material and orientation/reference side). Both surfaces optically polished flat; edges ground with bevels. Uncoated polished for full broadband transmission.

Key Specifications:

• Diameter: 100 mm

• Thickness: 18.5 mm (superior parallelism and rigidity)

• Substrate: Fused silica/quartz (marked “QTZ” – UV-grade, low thermal expansion, deep UV to NIR transmission)

• Surfaces: Both plano polished uncoated for maximum broadband utility.

• Clear Aperture: >90% (full diameter usable)

• Condition: Excellent clean surplus – pristine surfaces, no scratches/digs.

The substantial thickness provides outstanding stability under thermal load or pressure differentials – far superior to thinner windows.

Applications:

• High-power laser window/beam path (excimer, Nd:YAG, diode – exceptional damage threshold)

• Vacuum chamber, pressure vessel, or cryostat viewport (stable under pressure/thermal load)

• UV spectroscopy, lithography, or semiconductor processes

• Precision spacer or substrate for custom coating

• Optical experiments needing broadband, low-absorption transmission