1 inch fused silica BBAR witness sample – lot of 2

Product Description

1″ (25.4 mm) Diameter × 1.5 mm Thick Fused Silica Broadband AR-Coated Witness Sample – US Defense Laboratory Surplus

This is a high-precision witness sample fabricated for a U.S. Defense Laboratory narrow field-of-view (NFOV) optical system. Coated by Barr Associates, Inc. (now Materion Barr Precision Optics & Thin Film Coatings), this 1-inch diameter, 1.5mm thick fused silica disk features dual-side multilayer dielectric broadband anti-reflective (BBAR) coatings optimized for maximum transmission and minimal reflection across the visible to near-infrared spectrum. A pristine example of defense-grade coating technology.

Key Specifications:

• Diameter: 1″ (25.4 mm)

• Thickness: 1.5 mm

• Substrate: UV-grade fused silica (SiO₂) – high transmission from deep UV to near-IR

• Coating: Dual-side multilayer dielectric BBAR – optimized for visible to near-IR

• Performance: >99% average transmission, <0.5–1% reflection per surface (typical in passband)

• Condition: Like-new / excellent – clean, scratch-free surfaces; no haze, delamination, or defects

• Packaging: Original labeled protective bag

• Provenance: Coated alongside production optics for a U.S. Defense Laboratory NFOV space optics program

Why This Witness Sample Is Valuable:

• Defense-Grade Coating Quality: Represents the exact coating applied to high-performance NFOV optical components.

• Broadband Optimization: Dual-side BBAR ensures minimal ghosting and maximum throughput—critical for precision imaging systems.

• Ideal Reference Standard: Useful for verifying coating performance, calibrating instruments, or educational demonstration.

Applications:

• Coating Performance Verification: Reference sample for testing spectrophotometers, laser systems, or reflectometers.

• Optical Research & Development: Benchmark for designing or evaluating AR coatings in visible/NIR applications.

• Educational Tool: Demonstrate thin-film interference, AR principles, and defense optical standards in university labs.

• Laser & Imaging Systems: Temporary window or beam-splitter substrate in experimental setups requiring low loss.

Note:

This is a witness sample, not a functional optical component. Its primary value lies in its certified coating performance and provenance.