UV Fused Silica Metallic Neutral Density Filters

Broadband attenuation, UV to near IR
Metallic neutral density coating
Low wavefront distortion
UV grade fused silica
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 an ultra-pure UV grade fused silica substrate providing excellent transmission from the ultraviolet to the near-infrared. These precision polished substrates have flatness less than 1λ–2λ. 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 permanently marked with the optical density and are shipped with a transmission curve.

Our unique assortment of filters permits easy selection of any desired density, from 0–8 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	UV grade fused silica
Surface Flatness	25.4 mm Round: ≤1λ at 632.8 nm over the clear aperture 50.8 mm Square: ≤2λ at 632.8 nm over the clear aperture
Clear Aperture	≥central 80% of dimensions
Surface Quality	60-40 scratch-dig
Dimensions	±0.25 mm
Thickness	0.118 (3.0) ±0.25 [in. (mm)]
Wedge	≤3 arc min
Chamfers	0.25–0.76 mm face width x 45° ±15°
Angle of Incidence	0°
Optical Density at 632.8 nm	0.03 ±2.5%, 0.1 ±8%, 0.2 ±7%, 0.3 ±6%, 0.4 ±5% at 0.5 ±4%
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

UV Fused Silica Metallic Neutral Density Filters Table

Optical Density at 632.8 mm	Transmission at 632.8 mm	Quantity in Filter Set	Model	Model
Optical Density at 632.8 mm	Transmission at 632.8 mm	Quantity in Filter Set	25.4 mm Diameter	50.8 X 50.8 mm
0.03	93.3%	1	FRQ-ND003	FSQ-ND003
0.1	79.4%	2	FRQ-ND01	FSQ-ND01
0.2	63.1%		FRQ-ND02	FSQ-ND02
0.3	50.1%	1	FRQ-ND03	FSQ-ND03
0.4	39.8%		FRQ-ND04	FSQ-ND04
0.5	31.6%	1	FRQ-ND05	FSQ-ND05
0.6	25.1%		FRQ-ND06	FSQ-ND06
0.7	20%		FRQ-ND07	FSQ-ND07
0.8	15.8%		FRQ-ND08	FSQ-ND08
0.9	12.6%		FRQ-ND09	FSQ-ND09
1.0	10.0%	1	FRQ-ND10	FSQ-ND10
1.5	3.2%		FRQ-ND15	FSQ-ND15
2.0	1.0%	1	FRQ-ND20	FSQ-ND20
2.5	0.3%		FRQ-ND25	FSQ-ND25
3.0	0.1%	1	FRQ-ND30	FSQ-ND30
4.0	0.01%		FRQ-ND40	FSQ-ND40
Set of Metallic Neutral Density Filters			FR-ND	FS-ND

Model	Description	avail raw	Availability	price raw	Price	Qty. MULTI ADD
FR-ND	UV Fused Silica Metallic ND Filter Set, 25.4 mm Diameter, Includes 8 Filters	0	In Stock	573	$573.00	ADD
FRQ-ND003	UV Fused Silica Metallic ND Filter, 25.4 mm Diameter, 0.03 OD at 632.8 nm	0	In Stock	40	$40.00 $45.00	ADD
FRQ-ND01	UV Fused Silica Metallic ND Filter, 25.4 mm Diameter, 0.1 OD at 632.8 nm	0	In Stock	65	$65.00 $69.00	ADD
FRQ-ND02	UV Fused Silica Metallic ND Filter, 25.4 mm Diameter, 0.2 OD at 632.8 nm	0	In Stock	65	$65.00 $69.00	ADD
FRQ-ND03	UV Fused Silica Metallic ND Filter, 25.4 mm Diameter, 0.3 OD at 632.8 nm	0	In Stock	65	$65.00 $69.00	ADD
FRQ-ND04	UV Fused Silica Metallic ND Filter, 25.4 mm Diameter, 0.4 OD at 632.8 nm	0	In Stock	65	$65.00 $69.00	ADD
FRQ-ND05	UV Fused Silica Metallic ND Filter, 25.4 mm Diameter, 0.5 OD at 632.8 nm	0	In Stock	65	$65.00 $69.00	ADD
FRQ-ND06	UV Fused Silica Metallic ND Filter, 25.4 mm Diameter, 0.6 OD at 632.8 nm	0	In Stock	68	$68.00 $69.00	ADD
FRQ-ND07	UV Fused Silica Metallic ND Filter, 25.4 mm Diameter, 0.7 OD at 632.8 nm	0	In Stock	68	$68.00 $69.00	ADD
FRQ-ND08	UV Fused Silica Metallic ND Filter, 25.4 mm Diameter, 0.8 OD at 632.8 nm	0	In Stock	68	$68.00 $69.00	ADD
FRQ-ND09	UV Fused Silica Metallic ND Filter, 25.4 mm Diameter, 0.9 OD at 632.8 nm	0	In Stock	68	$68.00 $69.00	ADD
FRQ-ND10	UV Fused Silica Metallic ND Filter, 25.4 mm Diameter, 1.0 OD at 632.8 nm	0	In Stock	65	$65.00 $69.00	ADD
FRQ-ND15	UV Fused Silica Metallic ND Filter, 25.4 mm Diameter, 1.5 OD at 632.8 nm	0	In Stock	65	$65.00 $69.00	ADD
FRQ-ND20	UV Fused Silica Metallic ND Filter, 25.4 mm Diameter, 2.0 OD at 632.8 nm	1	1 Weeks	65	$65.00 $69.00	ADD
FRQ-ND25	UV Fused Silica Metallic ND Filter, 25.4 mm Diameter, 2.5 OD at 632.8 nm	0	In Stock	65	$65.00 $69.00	ADD
FRQ-ND30	UV Fused Silica Metallic ND Filter, 25.4 mm Diameter, 3.0 OD at 632.8 nm	0	In Stock	65	$65.00 $69.00	ADD
FRQ-ND40	UV Fused Silica Metallic ND Filter, 25.4 mm Diameter, 4.0 OD at 632.8 nm	0	In Stock	68	$68.00 $69.00	ADD
FS-ND	UV Fused Silica Metallic ND Filter Set, 50.8 x 50.8 mm, Includes 8 Filters	0	In Stock	1120	$1,120.00	ADD
FSQ-ND003	UV Fused Silica Metallic ND Filter, 50.8 x 50.8 mm, 0.03 OD at 632.8 nm	0	In Stock	116	$116.00 $118.00	ADD
FSQ-ND01	UV Fused Silica Metallic ND Filter, 50.8 x 50.8 mm, 0.1 OD at 632.8 nm	0	In Stock	126	$126.00 $132.00	ADD
FSQ-ND02	UV Fused Silica Metallic ND Filter, 50.8 x 50.8 mm, 0.2 OD at 632.8 nm	0	In Stock	126	$126.00 $132.00	ADD
FSQ-ND03	UV Fused Silica Metallic ND Filter, 50.8 x 50.8 mm, 0.3 OD at 632.8 nm	0	In Stock	128	$128.00 $132.00	ADD
FSQ-ND04	UV Fused Silica Metallic ND Filter, 50.8 x 50.8 mm, 0.4 OD at 632.8 nm	0	In Stock	126	$126.00 $132.00	ADD
FSQ-ND05	UV Fused Silica Metallic ND Filter, 50.8 x 50.8 mm, 0.5 OD at 632.8 nm	0	In Stock	128	$128.00 $132.00	ADD
FSQ-ND06	UV Fused Silica Metallic ND Filter, 50.8 x 50.8 mm, 0.6 OD at 632.8 nm	0	In Stock	132	$132.00	ADD
FSQ-ND07	UV Fused Silica Metallic ND Filter, 50.8 x 50.8 mm, 0.7 OD at 632.8 nm	0	In Stock	132	$132.00	ADD
FSQ-ND08	UV Fused Silica Metallic ND Filter, 50.8 x 50.8 mm, 0.8 OD at 632.8 nm	0	In Stock	130	$130.00 $132.00	ADD
FSQ-ND09	UV Fused Silica Metallic ND Filter, 50.8 x 50.8 mm, 0.9 OD at 632.8 nm	0	In Stock	136	$136.00	ADD
FSQ-ND10	UV Fused Silica Metallic ND Filter, 50.8 x 50.8 mm, 1.0 OD at 632.8 nm	0	In Stock	128	$128.00 $132.00	ADD
FSQ-ND15	UV Fused Silica Metallic ND Filter, 50.8 x 50.8 mm, 1.5 OD at 632.8 nm	0	In Stock	126	$126.00 $132.00	ADD
FSQ-ND20	UV Fused Silica Metallic ND Filter, 50.8 x 50.8 mm, 2.0 OD at 632.8 nm	0	In Stock	128	$128.00 $132.00	ADD
FSQ-ND25	UV Fused Silica Metallic ND Filter, 50.8 x 50.8 mm, 2.5 OD at 632.8 nm	0	In Stock	126	$126.00 $132.00	ADD
FSQ-ND30	UV Fused Silica Metallic ND Filter, 50.8 x 50.8 mm, 3.0 OD at 632.8 nm	0	In Stock	128	$128.00 $132.00	ADD
FSQ-ND40	UV Fused Silica Metallic ND Filter, 50.8 x 50.8 mm, 4.0 OD at 632.8 nm	0	In Stock	132	$132.00	ADD

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UV Fused Silica Metallic Neutral Density Filters

Specifications

UV Fused Silica Metallic Neutral Density Filters Table

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