Optical Window with Anti-reflection Coating (BK7) / WBMA

These optical windows have high-quality and may be used when light is passed through the opposite side of the partition or in the vacuum chamber. Since the windows have anti-reflection coatings the transmittance is increased so they can be used as a window for laser irradiation windows and the observation of the sample.

By anti-reflection coating with a dielectric multi-layer, it is reduced to less than 1% to 4% reflection loss of the glass surface.
Since we are using the high quality material, the image will not be distorted by the transmission of the glass, and the laser beam is not diffused.
When you insert an window perpendicular to the optical path of the laser, the angle of the transmitted beam will not be changed.


Common Specifications

Material BK7
Surface Flatness of Substrate λ/10
Parallelism <5″
Coating Multi-layer anti-reflection coating
Transmittance >Average 99% (Wavelength Range 400 - 700nm)
>Average 98.5% (Wavelength Range 633 - 1064nm): -IR1
>Average 98.5% (Wavelength Range 750 - 1550nm): -IR2
Incident Angle
Laser Damage Threshold 4J/cm2 (Laser pulse width 10ns, repetition frequency 20Hz)
Surface Quality (Scratch-Dig) 40 - 20
Clear Aperture 90% of the diameter


Schematic Outline Drawing


Part Number
Visible Range
(400 - 700nm)
How to specify the anti-reflection coating Diameter
(633 - 1064nm)
(750 - 1550nm)
WBMA-15C02-10-550 -IR1 -IR2 φ15mm 2mm
WBMA-15C03-10-550 -IR1 -IR2 φ15mm 3mm
WBMA-20C02-10-550 -IR1 -IR2 φ20mm 2mm
WBMA-20C03-10-550 -IR1 -IR2 φ20mm 3mm
WBMA-25C02-10-550 -IR1 -IR2 φ25mm 2mm
WBMA-25C03-10-550 -IR1 -IR2 φ25mm 3mm
WBMA-25.4C03-10-550 -IR1 -IR2 φ25.4mm 3mm
WBMA-30C02-10-550 -IR1 -IR2 φ30mm 2mm
WBMA-30C03-10-550 -IR1 -IR2 φ30mm 3mm
WBMA-40C04-10-550 -IR1 -IR2 φ40mm 4mm
WBMA-50C05-10-550 -IR1 -IR2 φ50mm 5mm
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