Compare Model Drawings, CAD & Specs Material Wavelength Range Size Optical Density Availability Price
$242
5 Weeks
Schott Borofloat 400-2000 nm Ø25.4 mm 0.04, 0.5, 1.0, 1.5, 2.0, 2.5
5 Weeks
$242
In Stock
Schott Borofloat 400-2000 nm Ø25.4 mm 0.04, 0.1, 0.2, 0.3, 0.4, 0.5
In Stock
$389
In Stock
Schott Borofloat 400-2000 nm Ø25.4 mm 0.04, 0.1, 0.2, 0.3, 0.4, 0.5, 1.0, 1.5, 2.0, 2.5
In Stock
shortpass filter set
$591
6 Weeks
UV Grade Fused Silica 350-2000 nm Ø25.4 mm 0.03, 0.1, 0.3, 0.5, 1.0, 2.0, 3.0
6 Weeks
shortpass filter set
$1,155
UV Grade Fused Silica 350-2000 nm 50.8 x 50.8 mm 0.03, 0.1, 0.3, 0.5, 1.0, 2.0, 3.0
shortpass filter set
$376
In Stock
B270 Optical Crown Glass 400-1200 nm Ø25.4 mm 0.04, 0.1, 0.3, 0.5, 1.0, 2.0, 3.0
In Stock
shortpass filter set
$4,062
6 Weeks
Optical Grade Germanium 2000-5000 nm Ø25.4 mm 0.3, 0.6, 1.0, 2.0, 3.0
6 Weeks
shortpass filter set
$417
3 Weeks
Absorptive Glass 400-900 nm Ø25.4 mm 0.04, 0.2, 0.4, 0.6, 0.8, 1.0, 2.0, 3.0
3 Weeks
shortpass filter set
$773
6 Weeks
Absorptive Glass 400-900 nm 50.8 x 50.8 mm 0.04, 0.2, 0.4, 0.6, 0.8, 1.0, 2.0, 3.0
6 Weeks

Features

Schott Borofloat Metallic ND Filter Set

Made with Inconel® metallic coatings on glass substrates, the Schott Borofloat glass ND filters provide spectrally uniform attenuation over the wavelength range from 0.4 to 2.0 µm. The reflective nature of the coatings helps reduce thermal effects when these filters are used with moderate-power lasers. Filters may be used individually or combined in series to obtain any desired density from 0.04 to 2.5.

UV Fused Silica Metallic ND Filter Set

The FR-ND and FS-ND UV Fused Silica neutral density filter sets consist of a logical assortment of filters packaged in a protective hard storage case. All filters are permanently marked with the optical density and are shipped with a transmission curve. The coating is deposited on one side of an ultra-pure UV grade fused silica substrate providing excellent transmission from the ultraviolet to the near-infrared (350-2000nm). Due to the absorptive nature of the metallic coating, use with high-power lasers should be avoided. Power levels less than 30 W/cm2 are advised.

Optical Crown Glass Metallic ND Filter Set

The FB-ND optical crown glass metallic neutral density filter Set consists of eight 25.4 mm diameter optical crown glass metallic ND filters packaged in a protective hard storage case. The metallic coating is deposited on one side of a cost-effective B 270 optical crown glass substrate, providing broadband attenuation for low-power applications. All filters are shipped with a transmission curve.

Absorptive ND Filter Set

The FS-3 and FS-3R neutral density filter sets consist of 9 absorptive glass. Compared to metallic ND filters, these absorptive filters are more economic and also reflect far less light toward the source 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 1-5 W/cm2 are advised.

Germanium Metallic ND Filter Set

The FS-IR Germanium metallic neutral density filter set consists of 5 infrared filters. The filters are made of 80-50 scratch dig Germanium substrate and offer higher OD tolerance in the 2 to 5 μm wavelength range. The graph shows that the curve is almost flat over the full wavelength range.

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.

Proper Orientation

To prevent unwanted interference from etalon effects, filters should be angled slightly with respect to the incident beam. To minimize back reflections, the filter should be oriented with the coated metallic surface facing the incident beam. Any light reflected from the uncoated second surface will pass through the metallic coating first, which will greatly attenuate unwanted back reflections.