Product Description
Premium Precision Optical Window – Surplus from a US Defense Laboratory
High-Precision 50mm N-BK7 Plano-Parallel Window – λ/10 Flatness, Pristine Condition
A laboratory-grade plano-parallel optical window sourced from a premier US Defense Research laboratory. Manufactured to exceptional standards for advanced photonics, high-power laser systems, and precision interferometry, this uncoated N-BK7 window offers outstanding optical quality and versatility for demanding research and instrumentation applications.
🔍 Key Specifications:
-
Diameter: 50 mm
-
Thickness: ~6 mm (highly uniform, plano-parallel)
-
Material: N-BK7 optical crown glass – excellent homogeneity, transmission from visible to near-IR
-
Surface Flatness: λ/10 or better over clear aperture
-
Parallelism: Extremely high – negligible wedge, suitable for critical optical paths
-
Surface Quality: Polished to fine scratch-dig standards (typical 20-10 or better)
-
Edge Finish: Fully polished, smooth, and chip-free
-
Coating: Uncoated – ideal for custom coating or maximum broadband transmission
-
Condition: Pristine – no visible defects
⚙️ Critical Applications:
-
High-Power Laser Systems: Cavity end window, beam sampler, or debris shield
-
Interferometry & Metrology: Reference flat, test plate, or window in Fizeau/Twyman-Green setups
-
Precision Instrumentation: Protective window in spectrometers, collimators, or sensing systems
-
Custom Coating Substrate: Excellent base for application-specific AR, HR, or filter coatings
-
Research & Prototyping: Core optical component in university, government, or industrial R&D labs



