Circular Variable Neutral Density Filters (CVND) - Alrad

Circular Variable Neutral Density Filters (CVND)

Circular Variable Neutral Density Filters (CVND)

Circular Variable Filters (UV-VIS-IR) are filter wheels that linearly attenuate light as the filter is rotated. As the filter rotates, the beam intensity is customized due to the density variation of a gradient metallic coating around the filter. These filters are fully customizable in optical density gradient function, transmission gradient function, substrate type, coating materials, and size to meet customer requirements. Densities can be supplied as a standard linear or a customized gradient function.

Custom sizes and densities are available upon request.

 

Specifications:

D = Log10(1/T)
Coating Types: Metallic
Anti-Reflection Coating: Available
Substrate Materials: BK-7, Fused Silica and ZnSe
Outside Diameter (OD): 25mm - 200mm ± 0.2mm
OD Tolerance: ± 5% Absolute
Inside Diameter: 7.5mm - 25.4mm ± 0.2mm
Thickness: 2.0mm ± 0.2mm
Optical Density Range: Specify: 0 to 1, 2, 3, 4, or 5
Wavelength Calibration: BK-7: 510nm

F.S: 510nm

ZnSe: 2.5µm
Wavelength Range: BK-7: 375nm - 2500nm

F.S: 200nm - 2500nm

ZnSe: 2.0µm - 5.0µm
Gradient Range: 270° Typical
Parallelism: < 3 Arc Minutes
TWE: < 2 Waves per 25mm
Centration: ± 0.2mm
Surface Quality: 80/50 Scratch & Dig
Clear Aperture: 80% of Diameter
Part Number Substrate Material Outer Diameter Inner Diameter Optical Density
R00500-xx BK-7 25mm 7.5mm Specify
R00510-xx BK-7 50mm 7.5mm Specify
R00515-xx BK-7 75mm 7.5mm Specify
R00520-xx BK-7 100mm 7.5mm Specify
R00522-xx BK-7 100mm 25.4mm Specify
R00525-xx BK-7 125mm 25.4mm Specify
R00530-xx BK-7 150mm 25.4mm Specify
R00550-xx BK-7 175mm 25.4mm Specify
R00580-xx BK-7 200mm 25.4mm Specify
Part Number Substrate Material Outer Diameter Inner Diameter Optical Density
R04400-xx Fused Silica 25mm 7.5mm Specify
R04410-xx Fused Silica 50mm 7.5mm Specify
R04415-xx Fused Silica 75mm 7.5mm Specify
R04420-xx Fused Silica 100mm 7.5mm Specify
R04422-xx Fused Silica 100mm 25.4mm Specify
R04425-xx Fused Silica 125mm 25.4mm Specify
R04430-xx Fused Silica 150mm 25.4mm Specify
R04450-xx Fused Silica 175mm 25.4mm Specify
R04465-xx Fused Silica 200mm 25.4mm Specify
Part Number Substrate Material Outer Diameter Inner Diameter Optical Density
R05600-xx ZnSe 25mm 7.5mm Specify
R05610-xx ZnSe 50mm 7.5mm Specify
R05620-xx ZnSe 100mm 7.5mm Specify
R00520-xx ZnSe 100mm 7.5mm Specify
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