Compare Model Drawings, CAD & Specs Size Optical Density Optical Density Tolerance Wavelength Range Availability Price
$29
In Stock
Ø12.7 mm 0.04 ±4% at 546.1 nm 400-900 nm
In Stock
$29
In Stock
Ø12.7 mm 0.2 ±4% at 546.1 nm 400-900 nm
In Stock
$29
In Stock
Ø12.7 mm 0.4 ±4% at 546.1 nm 400-900 nm
In Stock
$29
In Stock
Ø12.7 mm 0.6 ±4% at 546.1 nm 400-900 nm
In Stock
$29
In Stock
Ø12.7 mm 0.8 ±4% at 546.1 nm 400-900 nm
In Stock
$29
In Stock
Ø12.7 mm 1 ±4% at 546.1 nm 400-900 nm
In Stock
$29
In Stock
Ø12.7 mm 2 ±4% at 546.1 nm 400-900 nm
In Stock
$29
In Stock
Ø12.7 mm 3 ±4% at 546.1 nm 400-900 nm
In Stock
$38
In Stock
Ø25.4 mm 0.04 ±4% at 546.1 nm 400-900 nm
In Stock
$38
In Stock
Ø25.4 mm 0.1 ±4% at 546.1 nm 400-900 nm
In Stock
$38
In Stock
Ø25.4 mm 0.15 ±4% at 546.1 nm 400-900 nm
In Stock
$38
In Stock
Ø25.4 mm 0.2 ±4% at 546.1 nm 400-900 nm
In Stock
$38
In Stock
Ø25.4 mm 0.3 ±4% at 546.1 nm 400-900 nm
In Stock
$38
In Stock
Ø25.4 mm 0.4 ±4% at 546.1 nm 400-900 nm
In Stock
$38
In Stock
Ø25.4 mm 0.5 ±4% at 546.1 nm 400-900 nm
In Stock
$38
In Stock
Ø25.4 mm 0.6 ±4% at 546.1 nm 400-900 nm
In Stock
$38
In Stock
Ø25.4 mm 0.7 ±4% at 546.1 nm 400-900 nm
In Stock
$38
In Stock
Ø25.4 mm 0.8 ±4% at 546.1 nm 400-900 nm
In Stock
$38
In Stock
Ø25.4 mm 0.9 ±4% at 546.1 nm 400-900 nm
In Stock
$38
In Stock
Ø25.4 mm 1 ±4% at 546.1 nm 400-900 nm
In Stock
$38
In Stock
Ø25.4 mm 1.5 ±4% at 546.1 nm 400-900 nm
In Stock
$38
In Stock
Ø25.4 mm 2 ±4% at 546.1 nm 400-900 nm
In Stock
$38
In Stock
Ø25.4 mm 3 ±4% at 546.1 nm 400-900 nm
In Stock
$38
In Stock
Ø25.4 mm 4 ±4% at 546.1 nm 400-900 nm
In Stock
$81
In Stock
50.8 x 50.8 mm 0.04 ±4% at 546.1 nm 400-900 nm
In Stock
$81
In Stock
50.8 x 50.8 mm 0.1 ±4% at 546.1 nm 400-900 nm
In Stock
$81
In Stock
50.8 x 50.8 mm 0.15 ±4% at 546.1 nm 400-900 nm
In Stock
$81
In Stock
50.8 x 50.8 mm 0.2 ±4% at 546.1 nm 400-900 nm
In Stock
$81
In Stock
50.8 x 50.8 mm 0.3 ±4% at 546.1 nm 400-900 nm
In Stock
$81
In Stock
50.8 x 50.8 mm 0.4 ±4% at 546.1 nm 400-900 nm
In Stock
$81
In Stock
50.8 x 50.8 mm 0.5 ±4% at 546.1 nm 400-900 nm
In Stock
$81
In Stock
50.8 x 50.8 mm 0.6 ±4% at 546.1 nm 400-900 nm
In Stock
$81
In Stock
50.8 x 50.8 mm 0.7 ±4% at 546.1 nm 400-900 nm
In Stock
$81
In Stock
50.8 x 50.8 mm 0.8 ±4% at 546.1 nm 400-900 nm
In Stock
$81
In Stock
50.8 x 50.8 mm 0.9 ±4% at 546.1 nm 400-900 nm
In Stock
$81
In Stock
50.8 x 50.8 mm 1 ±4% at 546.1 nm 400-900 nm
In Stock
$81
In Stock
50.8 x 50.8 mm 1.5 ±4% at 546.1 nm 400-900 nm
In Stock
$81
In Stock
50.8 x 50.8 mm 2 ±4% at 546.1 nm 400-900 nm
In Stock
$81
In Stock
50.8 x 50.8 mm 3 ±4% at 546.1 nm 400-900 nm
In Stock
$81
In Stock
50.8 x 50.8 mm 4 ±4% at 546.1 nm 400-900 nm
In Stock

Features

Absorptive Neutral Density Glass for Low Power Applications

These neutral density filters are made from absorptive glass. This results in a lower cost product that is somewhat less fragile compared to coated metallic ND filters. Absorptive ND filters also reflect far less light toward the source compared with metallic ND Filters, which may be beneficial. Nevertheless stacking a large number of ND filters can still result in excessive undesired reflection due to Fresnel surface reflection. Due to the absorptive nature of the filter glass, use with high power lasers should be avoided. Power levels less than 30 W/cm2 are advised.

Spectrally Neutral for Visible Wavelengths

Absorptive glass ND filters are spectrally neutral over the visible spectral region. OD05 to OD40 optical densities are shown.

Additive Optical Densities

Optical density (OD) is given by the relationship: OD = -log(T) or T = 10(-OD) where T is transmittance (0≤T≤1). Optical Density, unlike transmittance, is additive. When multiple filters are stacked, the total density is easily found by adding up the densities of each filter in the series. For example to achieve desired transmittance of 8%, first calculate the equivalent density (OD = -log(0.08) = 1.097 ≅ 1.1), then find a combination of filters that adds to the desired number, such as a combination of an OD1 filter and an OD0.1 filter.

Finely Control Beam Attenuation

Our absorptive ND filters are available individually or in a set of 9. Filters may be used individually, or combined in series, to obtain any desired density from 0.04 to 4.0. The Ø25.4 mm and 50.8 mm square sizes are permanently marked with the optical density.

Proper Orientation

To prevent unwanted interference from etalon effects, filters should be angled slightly with respect to the incident beam.