75mm fused silica window AR coated

Product Description

Precision 75mm Fused Silica Plano-Plano Window – 10mm Thick, One-Side Broadband AR Coated

This is a versatile, high-quality optical window fabricated from UV-grade fused silica. Featuring a broadband anti-reflection (AR) coating on one side (arrow-marked for orientation) and an uncoated polished reverse side, it offers an optimal balance of low reflectance for visible wavelengths and maximum broadband transmission from deep UV to near-infrared (NIR). Ideal for laser, vacuum, and precision optical applications.

Key Specifications:

• Diameter: 75 mm

• Thickness: 10 mm (excellent parallelism)

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

• Coating:

  • Side 1: Broadband AR coating (visible-optimized; subtle magenta reflection) – arrow-marked edge for orientation

  • Side 2: Uncoated polished

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

• Condition: Excellent surplus – optical surfaces are pristine

Condition Note:

📍 NOTE: Contains a very small, superficial cosmetic nick on the uncoated side (common in handled lab optics). This nick does not affect transmission, reflection, or clear aperture performance. Full functionality is assured for even demanding applications.

Why This Window Is a Smart Choice:

• Optimized Coating Strategy: The AR-coated side minimizes reflections for visible light when oriented toward the source, while the uncoated side ensures maximum broadband transmission and avoids coating limitations for UV or high-power exposure.

• Clear Orientation Aid: The engraved arrow eliminates guesswork during installation, ensuring optimal performance.

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

Applications:

• Laser Systems: Beam path window for visible or UV lasers; orient AR-coated side toward the source for lowest loss.

• Vacuum & Cryogenic Viewports: Stable, high-transmission window for chamber applications.

• UV Spectroscopy & Lithography: Substrate for deep-UV processes requiring low reflectance on one side.

• Precision Optical Setups: Spacer, reference plate, or custom coating substrate.

• Broadband Experiments: Ideal for lab configurations requiring controlled reflections and wide spectral transmission.