75mm fused silica optical window

Product Description

Precision 75mm Fused Silica Plano-Plano Optical Window – 11mm Thick

This is a versatile, high-grade optical window fabricated from premium UV-grade fused silica. With a substantial 11mm thickness and a 75mm diameter, it provides exceptional rigidity, thermal stability, and broadband transmission from the deep UV through the visible and into the near-infrared (NIR). The inclusion of a partial broadband anti-reflection (AR) coating on one side makes it particularly effective for high-power laser and precision optical applications.

Key Specifications:

• Diameter: 75 mm

• Thickness: 11 mm (parallel within high precision)

• Material: UV-grade fused silica (low thermal expansion, high laser damage threshold, >90% transmission from ~180 nm to 2.5 µm)

• Surfaces: Both surfaces optically polished; one side has a partial broadband AR coating, the reverse side is uncoated polished

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

• Edge Finish: Finely ground with protective bevels

Why This Window Is a Superior Value:

• Dual-Surface Benefit: The partial AR coating reduces reflections for specific wavelengths, while the uncoated side is ideal for applications requiring maximum broadband transmission or serving as a reference surface.

• Robust Construction: The 11mm thickness provides excellent mechanical stability, minimizing distortion under pressure or thermal load.

• Lab-Grade Provenance: Sourced from research or industrial surplus, ensuring professional fabrication standards.

Applications:

• Laser Systems: As a durable beam path window or protective optic for excimer, Nd:YAG, or high-power diode lasers.

• Vacuum & Cryogenic Viewports: Ideal for chamber windows where thermal shock resistance and UV transmission are critical.

• UV Spectroscopy & Lithography: Substrate for deep-UV applications requiring low absorption and high durability.

• Optical Spacing & Reference: Use as a precision spacer, coating substrate, or reference plate in interferometry.

• Broadband Experimentation: Perfect for lab setups requiring transmission from the UV to the NIR.