Broadband Neutral Plate Beamsplitters For low power applications these plate beamsplitters provide a spectrally neutral reflectivity over a broad spectrum. The transmission and reflection values are equal within 3% over the entire visible spectrum. They utilize a thin film of Inconel alloy, which is both durable and of neutral density over a wide wavelength range. This film is deposited on BK7 optical glass or UV fused silica. The resulting beamsplitters are useful for applications spanning the visible to the near infra-red (350 – 2500 nm) when using BK7. If required for use in the UV, the range can be extended down to 200 nm by using UV fused silica substrate material.

Our ability can be up to:
Material: UV grade fused quartz,BK7A or other materials
Diameter: 5mm-300mm
Diameter Tolerance: +0.00/-0.10 mm
T/R ratio: specified by customers
Wavelength Range: 250-2500 nm
Parallelism: 1 arc minutes
Wedge: < 3 arcmin
Flatness: λ/8@632.8nm
Surface Quality:20-10 or better
Angle of Incidence: 0 to 45 degrees
Clear Aperture: 90% of Diameter
Coating: specified by customers