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:
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Diameter: 1″ (25.4 mm)
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Thickness: 1.5 mm
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Substrate: UV-grade fused silica (SiO₂) – high transmission from deep UV to near-IR
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Coating: Dual-side multilayer dielectric BBAR – optimized for visible to near-IR
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Performance: >99% average transmission, <0.5–1% reflection per surface (typical in passband)
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Condition: Like-new / excellent – clean, scratch-free surfaces; no haze, delamination, or defects
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Packaging: Original labeled protective bag
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Provenance: Coated alongside production optics for a U.S. Defense Laboratory NFOV space optics program
Why This Witness Sample Is Valuable:
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Defense-Grade Coating Quality: Represents the exact coating applied to high-performance NFOV optical components.
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Broadband Optimization: Dual-side BBAR ensures minimal ghosting and maximum throughput—critical for precision imaging systems.
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Ideal Reference Standard: Useful for verifying coating performance, calibrating instruments, or educational demonstration.
Applications:
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Coating Performance Verification: Reference sample for testing spectrophotometers, laser systems, or reflectometers.
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Optical Research & Development: Benchmark for designing or evaluating AR coatings in visible/NIR applications.
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Educational Tool: Demonstrate thin-film interference, AR principles, and defense optical standards in university labs.
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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.



