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Absorptive Neutral Density

Filters

Optical density ranges from 0.1 to 6.0
Variety of Schott materials Available

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. Each schott filter glass material has a spectrally flat absorption coefficient in the visible region. Since optical density is a function of the type of glass material and thickness, by varying these we are able to produce the entire line of absorptive ND filters. Holmarc offers Absorptive ND filters in unmounted and mounted options. Optical density of the absorptive ND filter is related to the transmission by the following equation;


OD    =    log10    ( 1 / T ),  or  T    =  10-OD



    Materials :     NG1, NG4, NG9 & NG11
    Surface quality :     40 - 20 ( scratch-dig )
    Dimensional Tolerance :     +0.00, -0.2 nm
    Clear aperture :     90 %
    Surface flatness :     λ / 4 @ 632.8 nm
    Parallelism :     ≤ 10 arc sec
    Damage threshold :     < 500 mJ / cm2 @ 532 nm CW laser

Absorptive Neutral density filters of custom sizes are available. Variety of cells and holders are available from Holmarc. For custom designs, contact at mail@holmarc.com







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...



Variable Neutral Density Filters ( Mounted )

Our Circular Variable ND filters (Mounted) are designed to provide continuous variable attenuation by rotating the filter...



Model No. Diameter
D ( mm )
Optical Density
(OD)
Material Price ($)
Unmounted Mounted Unmounted Mounted
HO-NDA-12.5-0.1 HO-NDA-12.5M-0.1 12.5 0.1 NG11 18.00 33.00
HO-NDA-12.5-0.2 HO-NDA-12.5M-0.2 12.5 0.2 NG11 18.00 33.00
HO-NDA-12.5-0.3 HO-NDA-12.5M-0.3 12.5 0.3 NG11 18.00 33.00
HO-NDA-12.5-0.4 HO-NDA-12.5M-0.4 12.5 0.4 NG4 18.00 33.00
HO-NDA-12.5-0.5 HO-NDA-12.5M-0.5 12.5 0.5 NG4 18.00 33.00
HO-NDA-12.5-0.6 HO-NDA-12.5M-0.6 12.5 0.6 NG4 18.00 33.00
HO-NDA-12.5-1.0 HO-NDA-12.5M-1.0 12.5 1.0 NG4 18.00 33.00
HO-NDA-12.5-1.3 HO-NDA-12.5M-1.3 12.5 1.3 NG4 18.00 33.00
HO-NDA-12.5-2.0 HO-NDA-12.5M-2.0 12.5 2.0 NG9 18.00 33.00
HO-NDA-12.5-3.0 HO-NDA-12.5M-3.0 12.5 3.0 NG9 18.00 33.00
HO-NDA-12.5-4.0 HO-NDA-12.5M-4.0 12.5 4.0 NG9 18.00 33.00
HO-NDA-12.5-5.0 HO-NDA-12.5M-5.0 12.5 5.0 NG9 18.00 33.00
HO-NDA-12.5-6.0 HO-NDA-12.5M-6.0 12.5 6.0 NG1 18.00 33.00
HO-NDA-25-0.1 HO-NDA-25M-0.1 25 0.1 NG11 32.00 51.00
HO-NDA-25-0.2 HO-NDA-25M-0.2 25 0.2 NG11 32.00 51.00
HO-NDA-25-0.3 HO-NDA-25M-0.3 25 0.3 NG4 32.00 51.00
HO-NDA-25-0.4 HO-NDA-25M-0.4 25 0.4 NG4 32.00 51.00
HO-NDA-25-0.5 HO-NDA-25M-0.5 25 0.5 NG4 32.00 51.00
HO-NDA-25-0.6 HO-NDA-25M-0.6 25 0.6 NG4 32.00 51.00
HO-NDA-25-1.0 HO-NDA-25M-1.0 25 1.0 NG4 32.00 51.00
HO-NDA-25-1.3 HO-NDA-25M-1.3 25 1.3 NG4 32.00 51.00
HO-NDA-25-2.0 HO-NDA-25M-2.0 25 2.0 NG9 32.00 51.00
HO-NDA-25-3.0 HO-NDA-25M-3.0 25 3.0 NG9 32.00 51.00
HO-NDA-25-4.0 HO-NDA-25M-4.0 25 4.0 NG9 32.00 51.00
HO-NDA-25-5.0 HO-NDA-25M-5.0 25 5.0 NG9 32.00 51.00
HO-NDA-25-6.0 HO-NDA-25M-6.0 25 6.0 NG1 32.00 51.00

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