Products: Standard Filter Substrates

Acton’s filter substrates are made from select grades of the finest available optical materials.

Filter substrates are qualified for transmission requirements down to 120 nm.

Note: Filter substrates are available with transmittance traces for an additional charge. Contact us at for more information.


Filter Substrates

Part Number Diameter Thickness Substrate Material
WFS-.5D (WCF-, WMF-) 0.5” (12.7mm) 0.079” (2mm) UV Fused Silica, CaF2, MgF2
WFS-1D (WCF-, WMF-) 1.0” (25.4mm) 0.098” (2.5mm) UV Fused Silica,CaF2, MgF2
WFS-1.5D (WCF-, WMF-) 1.5” (38.1mm) 0.200” (5mm) UV Fused Silica, CaF2, MgF2
WFS-2D (WCF-, WMF-) 2.0” (50.8mm) 0.157” (4mm) UV Fused Silica, CaF2, MgF2

NOTE: WFS= UV Fused Silica, WCF = CaF2, WMF = MgF2 | 2“ Diameter CaF2 and MgF2 Filter Substrates are 5mm Thick


Material Material: UV Laser Grade Fused Silica UV Grade Fused Silica, CaF2, MgF2
Diameter Tolerance +0.00/-0.005”
Thickness Tolerance +/-0.25mm
Surface Figure Both sides: < 2 Waves @ 632.8nm
Parallelism 3 arc min
Scratch/Dig 20-10
Chamfer 0.5mm x 45°
Clear Aperture Central 85%


UV fused silica transmission properties