Premium λ/10 Fused Silica Optical Flat / Precision Window – 125mm Diameter

Pristine used condition – surfaces are exceptionally clean with no scratches, chips, or damage visible under inspection. offering a rare opportunity to own laboratory-grade optics at a fraction of new cost. Handwritten edge marking: “R1 ↑” for preferred surface orientation – does not impact optics.

Key Specifications:

• Diameter: 125.0 mm

• Thickness: 12.5 mm (robust design for superior rigidity and minimal distortion over large aperture)

• Material: UV-grade fused silica (equivalent to Corning 7980) – excellent transmission from deep UV (~190 nm) to near-IR (~2.5 μm)

• Surface Flatness: λ/10 peak-to-valley transmitted wavefront

• Surface Quality: 20-10 scratch-dig

• Parallelism: <10 arcseconds

• Coating: None (uncoated both sides) – ~4% reflection per surface, no coating colors or iridescence

• Edges: Fine ground/beveled for safe handling

Applications:

• Metrology/Interferometry: Ideal master optical flat for testing flatness of surfaces (gauge blocks, prisms, mirrors, machine tools) using interference fringes under monochromatic light (He-Ne laser, sodium lamp, etc.).

• Laser Systems: High laser-damage-threshold protective window for UV/visible/near-IR beams with minimal wavefront distortion.

• Vacuum & Viewports: Low-outgassing, inert material for UHV chambers or scientific setups.

• Imaging/Research: Distortion-free window for spectrometers, telescopes, microscopes, or beam paths.

• Hobbyist/Experimental: Great for building home interferometers, alignment tools, or precision optical benches.