50mm N-BK7 optical window ex-defense lab

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