China High Precision Optical Protective Window with 40-20 S-D Surface Quality Optical Lens Manufacture and Factory

High Precision Optical Protective Window with 40-20 S-D Surface Quality Optical Lens

The WBK Series (BK7) and WFS Series (fused silica) laser windows are precision optics built for demanding laser systems. They support 1064 nm, 532 nm, and 355 nm wavelengths with high transmission and robust performance. Manufactured to +0/-0.13 mm diameter tolerance and 40-20 S-D surface quality, they are stocked in diameters from 12.7 mm to 150 mm and function as protective windows, output couplers, or beam delivery optics.

Parameter	Specification Value
Diameter Tolerance	+0/-0.13mm
Thickness Tolerance	±0.25mm
Parallelism	< 3 arc min.
Clear Aperture	>90%
Surface Flatness	λ/4 per 1″Dia@632.8nm
Surface Quality	40-20 S-D

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BK7 and Fused Silica laser windows

✅All windows are manufactured to rigorous specifications: 40-20 S-D surface quality, λ/4 flatness at 632.8 nm, <3 arc min parallelism, and >90% clear aperture. These standards ensure low wavefront distortion and minimal beam scattering.
✅Choose between Grade A BK7—a cost-effective solution for NIR and visible applications (1064 nm, 532 nm)—or fused silica, which offers superior UV transmission (343–355 nm) and higher thermal stability for demanding high-power UV systems.
✅ Diameters range from 12.7 mm to 150 mm, with thicknesses spanning 1.1 mm to 9.5 mm. This broad selection ensures a precise fit for virtually any optical mount or laser head configuration.
✅With AR coatings, transmission exceeds 99.5%, while the high damage threshold supports reliable operation under intense irradiation—whether from CW lasers or high-peak-power pulsed sources in industrial production settings.