China BK7 & Fused Silica Protective Windows – AR Coated for 1064nm Fiber Lasers, 40-20 S-D, λ/4 Flatness Manufacture and Factory

BK7 & Fused Silica Protective Windows – AR Coated for 1064nm Fiber Lasers, 40-20 S-D, λ/4 Flatness

These BK7 and fused silica protective windows are precision-engineered for use in high-power fiber laser systems, including laser cutting, welding, marking, and cleaning applications. With excellent transmission from ultraviolet to near-infrared, low thermal expansion, and outstanding cost-effectiveness, BK7 and fused silica are the preferred materials for demanding industrial laser environments.

Key Specifications:

Surface quality: 40-20 scratch/dig
Surface flatness: λ/4 per 1″ diameter @632.8nm
Parallelism: < 3 arc minutes
Clear aperture: >90%
Diameter tolerance: +0/-0.13mm
Thickness tolerance: ±0.25mm

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Available in a wide range of standard diameters from 24mm to 116mm and thicknesses from 1.1mm to 3.0mm (see part numbers WBK-24-1.4 through WBK-116-2). Most models are AR coated for 1064nm – the dominant wavelength for fiber lasers. A special dual-band model (WBK-84-2YG) supports both 532nm and 1064nm, making it suitable for green and infrared hybrid laser systems.

These laser protective windows are designed to withstand high thermal loads while maintaining optical clarity. The AR coating delivers high transmittance, reducing back reflections and protecting sensitive optics inside the laser head. Whether you need a standard round window for a fiber laser cutting head or a custom size, our BK7 and fused silica windows offer reliable performance and fast availability.

Optimize your fiber laser system’s uptime and beam quality with our precision protective windows – available off-the-shelf in over 20 standard sizes.