High-precision Visible Windows are crafted from premium optical glass, available in two industry-leading materials: N-BK7 and H-K9L. As precision parallel plane plates, they feature ultra-low optical dispersion, exceptional light transmittance across the visible spectrum (400-700nm), and superior optical uniformity, ensuring minimal light loss and signal distortion during transmission.

Material | Optical Glass, N-BK7, H-K9L,etc. |
Dimensional tolerances | +/-0.05, +/-0.1mm |
Surface Flatness | λ/10~1λ |
Parallelism | < 10 arc seconds |
Surface Quality | 10/5,20/10,40/20 |
Edge Chip | <0.1mm |
Bevel | Protective bevel, or based on clients’ requests |
Clear Aperture | >90% |
Coating | According to customer's request |
Our Visible Windows (compatible with N-BK7 / H-K9L optical glass) are precision-engineered parallel plane plates, designed as dedicated protective solutions for electronic sensors and detectors in external environments. As high-precision optical components, they excel in preserving signal integrity while safeguarding devices from daily external damage—forming a critical barrier between internal precision systems and harsh external conditions.
1.Core Materials and Optical Properties
Crafted from premium-grade optical glass (N-BK7 / H-K9L), our Visible Windows deliver industry-leading optical consistency and performance:
✅Superior Light Transmittance: Maintains ultra-high transmittance across the 400-700nm visible spectrum, minimizing light loss and ensuring clear signal transmission for sensors/detectors.
✅Ultra-Low Dispersion: Strictly controls optical dispersion to avoid signal distortion or color deviation, guaranteeing accurate and stable detection results in diverse applications.
✅Precision Parallel Structure: Engineered as perfect parallel plane plates, eliminating light path deviation during transmission—critical for maintaining the alignment accuracy of optical systems.
2. Core Protective Advantages
Beyond optical performance, our Visible Windows excel in comprehensive device protection:
✅Multi-Layer Defense Effectively shields devices from dust, moisture, scratches, and minor mechanical collisions, extending the service life of sensors and detectors without compromising optical functionality.
✅Durable & Stable Construction: Resists daily wear and environmental changes (e.g., temperature fluctuations), ensuring long-term reliable operation without performance degradation.
✅Non-Intrusive Design: Maintains a slim profile that integrates seamlessly with your existing equipment, avoiding interference with internal component layout or signal pathways.
3. Wide-Ranging Application Scenarios
Our Visible Windows are widely adopted across professional optical systems due to their versatility and reliability:
✅ Industrial Detection Equipment: Used in photoelectric sensors, dimensional gauges, and automated inspection platforms, ensuring stable signal transmission in dusty or humid workshop environments.
✅ Medical Optical Instruments: Applied in analytical detectors, sample handling systems, and medical photoelectric monitoring devices, meeting strict precision and hygiene standards.
✅ Security & Monitoring Systems: Serves as protective windows for security photoelectric sensors, outdoor monitoring cameras, and access control equipment, enduring outdoor exposure and mechanical wear.
4. Customization Options (Tailored for Your Needs)
To match diverse device requirements, we offer full customization support:
✅Size & Thickness Customization: Customize dimensions (length/width) and plate thickness to fit your specific sensor/detector model.
✅Surface Coating Customization: Support optional coatings including anti-reflection (AR) coatings (boost transmittance further), anti-fingerprint coatings, and scratch-resistant coatings.
✅Precision Processing: Customize according to your equipment’s installation space, signal frequency, and environmental adaptability requirements.
If you need to confirm compatibility with your existing device or request a sample for evaluation, please feel free to contact us. Our professional team will provide tailored solutions and detailed parameter configurations to meet your project needs!


Phone: +86 189 4674 7897
E-mail: info@aosoptics.com
Whatsapp:8618946747897
Add: Yiju Road High-Tech Zone, Changchun City, Jilin Province, China