BK7 Optical Windows Description
BK7 optical windows are high-quality flat glass substrates made from borosilicate crown glass, known for its excellent optical properties, durability, and manufacturability. With high surface quality, tight dimensional control, and minimal transmitted beam deviation, BK7 windows are ideal for use in systems that require precise light transmission with minimal optical distortion.
BK7 offers a broad transmission range from 330 nm to 2100 nm, covering the visible and near-infrared spectrum. It features a low bubble and inclusion content, making it suitable for high-performance optical systems. Additionally, BK7 is relatively easy to polish and coat, making it a cost-effective choice for both standard and custom optical applications.
Due to its excellent mechanical strength and moderate thermal stability, BK7 is well-suited for use in controlled environments. However, it is not recommended for deep UV applications or extreme temperature fluctuations, where materials like fused silica or sapphire would perform better.
BK7 Optical Windows Applications
Projection Optical Systems
BK7 windows are commonly used in projection systems due to their excellent surface flatness and clarity. They help maintain beam quality while isolating the light path from dust, air turbulence, or thermal fluctuations.
Imaging and Detection Systems
In CCD and CMOS imaging systems, BK7 windows are used as protective covers or optical interfaces. Their high transmittance and low autofluorescence make them ideal for sensitive imaging in scientific, industrial, and medical applications.
Optical Measurement & Metrology
BK7 is frequently used in interferometers, spectrometers, and wavefront sensors, where precise wavefront control and low beam deviation are critical.
Laser and Illumination Systems
As protective elements in laser optics, BK7 windows offer a balance between durability and optical quality, suitable for moderate power laser systems and general illumination optics.
Environmental and Industrial Enclosures
BK7 windows are installed in sealed housings or pressure cells to allow light passage while protecting internal components from vacuum, gas, or harsh environments (within BK7’s thermal and chemical tolerance).
Biomedical and Laboratory Equipment
Used in microscopes, diagnostic devices, and flow cytometers, BK7 windows serve as transparent, durable interfaces between optical components and biological samples.
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