Yangzhou UJ Optical Element Co.,Ltd.

Optical glass window K9 BK7 window

    Optical glass window 
    BK7 window
    Shape: Round, Rectangle, Square
    Customized Size
DETAILS
 

Optical glass windows are designed for using in optical systems to separate two environments while passing a particular spectral range between them. 

It has high wavefront distortion, high transmission and high parallelism which ensure system’s imaging and high precision.

Optical glass window Material
MaterialBK7
Properties

Transmission Range: 330nm~2100nm

Thermal Expansion Coefficient: 7.5X10-6 /K

Refractive Index: 1.5164@588nm

Density: 2.52 g/cm3

ApplicationBK7 glass is excellent material for most application over visible and near IR spectrum.
Spectral curveBK7 window transmittance.jpg


Parameters for optical glass window
MaterialBK7
Dimension Tolereance
±0.1mm
Clear Aperture>90%
Parallelism

Standard: 3 arc minute

High Precision: 10 arc seconds

Surface Quality

Standard: 60/40

High Precision: 20/10

Wavefront Distortion

Standard: λ@633nm per 25mm

High Precision: λ/8@633nm per 25mm

ChamferProtected <0.5mmx45deg
CoatingAvailable upon request



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