Optical Crown Glass Metallic Neutral Density Filters

Broadband attenuation, visible to near IR
Metallic neutral density coating
Cost effective optical crown glass
For lower power applications

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Our metallic neutral density coatings provide broadband attenuation for lower power applications. The coating is deposited on one side of a cost effective B 270 optical glass substrate, providing excellent performance in the visible and near-infrared. The second polished side is uncoated.

These filters are available individually or in a set of eight. The set consists of a logical assortment of filters packaged in a protective hardwood case. All filters are shipped with a transmission curve.

Our unique assortment of filters permits easy selection of any desired density from 0–6 with 0.1 OD resolution by using individual or combinations of filters. Optical density (OD) is defined by the relationship:

OD = -log(T) or T = 10^-OD
where T is transmission (0≤T≤1). The density of a series of filters, unlike transmission, is additive. Custom densities can therefore be obtained by stacking filters, however stacking an excessive number of filters can lead to numerous unwanted back reflections.
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. For attenuation of high-energy lasers our Model 935 variable attenuator is recommended (High-Energy Variable Attenuators).

Specifications

Material	B 270 optical crown glass
Surface Flatness	≤5λ at 632.8 nm over the clear aperture
Clear Aperture	≥central 80% of dimensions
Surface Quality	60-40 scratch-dig
Diameter Tolerance	+0/-0.50 mm
Thickness	0.118 (3.0) ±0.25 [in. (mm)]
Wedge	≤5 arc min
Chamfers	0.25–0.76 mm face width x 45° ±15°
Angle of Incidence	0°
Optical Density at 632.8 nm	0.04 ±2.5%, 0.1 ±8%, 0.2 ±7%, 0.3 ±6%, 0.4 ±5%, and ±4% at 0.5≤OD≤3.0
Durability	MIL-C-48497A, adhesion, humidity, moderate abrasion, and solubility requirements
Cleaning	Non-abrasive method, acetone or isopropyl alcohol on lens tissue recommended (see Care and Cleaning of Optics)
Damage Threshold	30 W/cm² CW, typical; not recommended for pulsed laser use

Optical Crown Glass Metallic Neutral Density Filters Table

Model	Optical Density	Transmission at 632.8 nm	Quantity in Filter Set	Oriel Model
25.4 mm Dia	Optical Density	Transmission at 632.8 nm	Quantity in Filter Set	Oriel Model
FBR-ND004	0.04	91.6 %	1
FBR-ND01	0.1	79.4 %	2	50271
FBR-ND02	0.2	63.1 %		50272
FBR-ND03	0.3	50.1 %	1	50273
FBR-ND04	0.4	39.8 %		50274
FBR-ND05	0.5	31.6 %	1	50275
FBR-ND10	1.0	10.0 %	1	50281
FBR-ND15	1.5	3.2 %		50282
FBR-ND20	2.0	1.0 %	1	50283
FBR-ND25	2.5	0.3 %
FBR-ND30	3.0	0.1 %	1	50284
FB-ND	Set of Metallic Neutral Density Filters

Note: 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.

Model	Description	avail raw	Availability	price raw	Price	Qty. MULTI ADD
FB-ND	Optical Crown Glass Metallic ND Filter Set, 25.4 mm Diameter, Inc: (8) Filters	0	In Stock	364	$364.00	ADD
FBR-ND004	Metallic ND Filter, Optical Crown Glass, 25.4 mm Diameter, 0.04 OD at 632.8 nm	0	In Stock	27	$27.00 $29.00	ADD
FBR-ND01	Metallic ND Filter, Optical Crown Glass, 25.4 mm Diameter, 0.1 OD at 632.8 nm	0	In Stock	40	$40.00	ADD
FBR-ND02	Metallic ND Filter, Optical Crown Glass, 25.4 mm Diameter, 0.2 OD at 632.8 nm	0	In Stock	41	$41.00	ADD
FBR-ND03	Metallic ND Filter, Optical Crown Glass, 25.4 mm Diameter, 0.3 OD at 632.8 nm	0	In Stock	41	$41.00	ADD
FBR-ND04	Metallic ND Filter, Optical Crown Glass, 25.4 mm Diameter, 0.4 OD at 632.8 nm	0	In Stock	41	$41.00	ADD
FBR-ND05	Metallic ND Filter, Optical Crown Glass, 25.4 mm Diameter, 0.5 OD at 632.8 nm	0	In Stock	41	$41.00	ADD
FBR-ND10	Metallic ND Filter, Optical Crown Glass, 25.4 mm Diameter, 1.0 OD at 632.8 nm	0	In Stock	41	$41.00	ADD
FBR-ND15	Metallic ND Filter, Optical Crown Glass, 25.4 mm Diameter, 1.5 OD at 632.8 nm	0	In Stock	41	$41.00	ADD
FBR-ND20	Metallic ND Filter, Optical Crown Glass, 25.4 mm Diameter, 2.0 OD at 632.8 nm	0	In Stock	41	$41.00	ADD
FBR-ND25	Metallic ND Filter, Optical Crown Glass, 25.4 mm Diameter, 2.5 OD at 632.8 nm	0	In Stock	41	$41.00	ADD
FBR-ND30	Metallic ND Filter, Optical Crown Glass, 25.4 mm Diameter, 3.0 OD at 632.8 nm	0	In Stock	41	$41.00	ADD
FBS-ND004	Metallic ND Filter, Optical Crown Glass, 50.8 x 50.8 mm, 0.04 OD at 632.8 nm	0	In Stock	45	$45.00 $48.00	ADD
FBS-ND01	Metallic ND Filter, Optical Crown Glass, 50.8 x 50.8 mm, 0.1 OD at 632.8 nm	0	In Stock	63	$63.00	ADD
FBS-ND02	Metallic ND Filter, Optical Crown Glass, 50.8 x 50.8 mm, 0.2 OD at 632.8 nm	0	In Stock	63	$63.00	ADD
FBS-ND03	Metallic ND Filter, Optical Crown Glass, 50.8 x 50.8 mm, 0.3 OD at 632.8 nm	1	1 Weeks	63	$63.00	ADD
FBS-ND04	Metallic ND Filter, Optical Crown Glass, 50.8 x 50.8 mm, 0.4 OD at 632.8 nm	0	In Stock	63	$63.00	ADD
FBS-ND05	Metallic ND Filter, Optical Crown Glass, 50.8 x 50.8 mm, 0.5 OD at 632.8 nm	0	In Stock	63	$63.00	ADD
FBS-ND10	Metallic ND Filter, Optical Crown Glass, 50.8 x 50.8 mm, 1.0 OD at 632.8 nm	0	In Stock	63	$63.00	ADD
FBS-ND15	Metallic ND Filter, Optical Crown Glass, 50.8 x 50.8 mm, 1.5 OD at 632.8 nm	0	In Stock	63	$63.00	ADD
FBS-ND20	Metallic ND Filter, Optical Crown Glass, 50.8 x 50.8 mm, 2.0 OD at 632.8 nm	0	In Stock	60	$60.00 $62.00	ADD
FBS-ND25	Metallic ND Filter, Optical Crown Glass, 50.8 x 50.8 mm, 2.5 OD at 632.8 nm	0	In Stock	63	$63.00	ADD
FBS-ND30	Metallic ND Filter, Optical Crown Glass, 50.8 x 50.8 mm, 3.0 OD at 632.8 nm	0	In Stock	63	$63.00	ADD

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Optical Crown Glass Metallic Neutral Density Filters

Specifications

Optical Crown Glass Metallic Neutral Density Filters Table

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