N-BK7 Windows

N-BK7 Windows

BK7 is a borosilicate glass material with good transparency and refractive index, making it a quality choice for optical windows, substrate materials, or wafers. Its benefits include properties such as low dispersion, high optical uniformity, and low absorption. It is primarily used in the visible and near-infrared spectra for industrial, medical, and high-precision, low-power laser applications with AR coatings to enhance transmittance.


CLZ Optical Co., Ltd. offers a comprehensive stock of high-quality BK7 optical windows, available in a wide range of sizes, thicknesses, and coatings to meet the diverse needs of optical systems and instrumentation. BK7 is a popular, high-performance borosilicate crown glass known for its excellent optical clarity, high transmission in the visible and near-infrared (NIR) ranges, and reliable mechanical strength. It is an ideal choice for applications requiring durable, cost-effective windows with superb optical performance.


Our extensive BK7 Windows Stock ensures quick availability for both standard and urgent orders, helping customers reduce lead times and avoid production delays. These windows are widely used in scientific research, imaging systems, laser devices, medical instrumentation, and industrial applications. In addition to our ready-to-ship stock, we also provide custom sizing, edge treatments, and optional anti-reflective or protective coatings to match specific project requirements. With over a decade of experience in precision optics manufacturing, CLZ Optical Co., Ltd. delivers dependable optical solutions backed by professional service and technical support.



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Contáctenos para obtener descuentos en piezas en stock superiores a 10 unidades y cantidades por volumen/OEM.

N.º de tipo Ficha técnica MaterialsDiameter (mm)Thickness (mm)CoatingFlatness (P-V)
l-65651554 - BK7 or equivalent 30 5 Uncoated
l-556565623 - UV Fused Silica 20 2 Uncoated
L-xxx56565 - BK7 or equivalent 20x25 5 MgF2 AT 550nm

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Diameter (mm)

0 200

Thickness (mm)

Materials

BK7 or equivalent
UV Fused Silica
Sapphire

Coating

Uncoated
MgF2 AT 550nm
BBAR Ravg<0.35% AT 420-680nm
BBAR Ravg<0.8% AT 400-900nm
BBAR Ravg<0.5% AT 630-1100nm
BBAR Ravg<0.5% AT 750-1500nm

Flatness (P-V)

λ/4