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Variable Neutral Density Filters

Mounted

360° Rotation
Continuous variable attenuation

Our Circular Variable ND filters ( Mounted ) are designed to provide continuous variable attenuation by rotating the filter. Front side of our variable filter is coated with Inconel thin film and back side is antireflection coated to reduce unwanted reflection losses. Holmarc offers variable neutral density filters in two substrates; BK7 or equivalent & Fused Silica.



    Substrate materials :     Bk7 or equivalent & UV fused silica
    Surface quality :     40 - 20 ( scratch-dig )
    Dimensional Tolerance :     +0.00, -0.2 nm
    Thickness :     3 ± 0.2 mm
    Surface flatness :     λ / 4 @ 632.8 nm
    Parallelism :     ≤ 1 arc sec
    Coating :     Front surface= Inconel
    Back surface = anti-reflection










Absorptive Neutral Density Filters

Absorptive Neutral Density Filters attain functions by absorbing light with minimal reflection. Holmarc’s absorptive neutral density filters are made by four special filter glass materials from Schott.





Reflective Neutral Density Filters

Reflective Neutral Density Filters attenuate the light beam by a combination of reflection and absorption. Holmarc’s reflective neutral density filters...



Model No. OD ( mm ) ID ( mm ) Material Price ($)
HO-VND-N50 50 13 BK7 or equivalent 324.17
HO-VND-F50 50 13 UV Fused Silica 414.17
HO-VND-N75 75 25 BK7 or equivalent 391.67
HO-VND-F75 75 25 UV Fused Silica 479.17
HO-VND-N100 100 25 BK7 or equivalent 457.50
HO-VND-F100 100 25 UV Fused Silica 544.17

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