This pristine fused silica witness sample features high-performance anti-reflection (AR) dielectric coatings—optimized for broadband visible to near-IR applications (~400–1000 nm, peak transmission in 400–700 nm visible spectrum).
Key Specifications
- Manufacturer/Coater: Barr Associates, Inc. (thin-film experts, now Materion Precision Optics)
- Description: Anti-Reflection (AR) coating witness sample
- Substrate: High-purity fused silica (SiO₂) – low thermal expansion, ideal for precision visible/NIR
- Coating: Multi-layer dielectric AR stack (SiO₂) – transmission >99% per surface, reflection <0.5–1% in visible broadband
- Size: 1″ diameter (≈25.4 mm), 1.3 mm thick
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- Condition: Excellent surplus – clean, highly transparent surface with classic AR coating appearance (slight color tint under certain angles), preserved in original packaging
Why This Witness Sample Is Special This witness directly supported the Space Surveillance Telescope (SST) — 3.5-meter wide-field system for detecting faint space debris and satellites. Barr’s dielectric coatings ensure maximum light efficiency, minimal scatter, and long-term stability in demanding environments
Versatile Applications
- Visible/NIR Laser & Optics Experiments – AR-coated window or beam splitter for HeNe, diode lasers, or telescopes. Reduces losses and ghost images in lab setups.
- Astronomy & Surveillance Optics Projects – Lens element in DIY wide-field telescopes, CCD cameras, or educational models of space surveillance systems (direct connection to SST).
- Scientific Instruments – High-transmission component in spectrometers, interferometers, microscopes, or imaging systems.
- Laser Communication / LIDAR Prototypes – AR-coated optics for visible/NIR free-space links or ranging experiments.
- Display & Educational Use – Stunning clarity and subtle coating colors make it a beautiful demonstration piece for optics classes or collections.
| Weight | 1 lbs |
|---|---|
| Dimensions | 9 × 6 × 1 in |
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