Metallic Neutral Density Filters | borosilicate

Metallic Neutral Density filters comprise a thin metallic layer on a borosilicate glass or UV grade fused silica polished window. Metallic ND filters attenuate the light by reflection and thus avoid the possible heating issues with glass and gelatine neutral density filter types. However care must be taken to ensure the reflected light does not cause problems.

Our stock range of visible/IR range of Metallic Neutral Density Filters are coated on low-expansion borosilicate glass substrates and cover the range from 350-2500nm. Our UV range of Metallic Neutral Density Filters are coated on UV grade fused silica and therefore cover the useful UV region down to 170nm.

We stock uncoated borosilicate or equivalent and UV fused silica substrates so custom Metallic filters can be supplied to your specific request. Please contact our technical sales team with your requirements.

Material:
Blocking Range:
OD Tolerance
Diameter:
Length/Width:
Thickness:
Clear Aperture:
Flatness:
Parallelism:
Surface Quality:

Borosilicate (LEGB) or equivalent, UV fused silica
400-700nm
±5% average over blocking range
+0/-0.2 mm
± 0.2 mm
± 0.1 mm
90%
<2λ
<1 arc min
<60/40

Mounting of diameters and squares.
Antireflective coatings can be applied to one or both faces for improved transmission.
Cutting down or edged to special shapes and sizes at short notice.
Larger sizes are available.
Custom OD values to your specific requirement.
Available in sets, supplied in a wooden storage box for research and laboratory use.

Capabilities - Neutral Density Filters

Name	Optical Density	Transmission (%)	Diameter (mm)	Length (mm)	Width (mm)	Thickness (mm)	Material/Equivalent	Type	Price	Buy
FNM00325 pdf	0.03	93	25			2	Borosilicate	Uncoated Borosilicate	$26.69
FNU00325 pdf	0.03	93	25			2	UV Fused Silica	Uncoated UV Fused Silica	$30.27
FNM00350 pdf	0.03	93		50	50	2	Borosilicate	Uncoated Borosilicate	$40.45
FNU00350 pdf	0.03	93		50	50	2	UV Fused Silica	Uncoated UV Fused Silica	$48.93
FNM0125 pdf	0.1	79	25			2	Borosilicate	Metallic ND Filter	$34.40
FNU0125 pdf	0.1	79	25			2	UV Fused Silica	Metallic ND Filter	$64.98
FNM0150 pdf	0.1	79		50	50	2	Borosilicate	Metallic ND Filter	$53.52
FNU0150 pdf	0.1	79		50	50	2	UV Fused Silica	Metallic ND Filter	$103.21
FNM0225 pdf	0.2	63	25			2	Borosilicate	Metallic ND Filter	$34.40
FNU0225 pdf	0.2	63	25			2	UV Fused Silica	Metallic ND Filter	$64.98
FNM0250 pdf	0.2	63		50	50	2	Borosilicate	Metallic ND Filter	$53.52
FNU0250 pdf	0.2	63		50	50	2	UV Fused Silica	Metallic ND Filter	$103.21
FNM0313 pdf	0.3	50	12.5			2	Borosilicate	Metallic ND Filter	$22.94
FNU0313 pdf	0.3	50	12.5			2	UV Fused Silica	Metallic ND Filter	$30.58
FNM0325 pdf	0.3	50	25			2	Borosilicate	Metallic ND Filter	$34.40
FNU0325 pdf	0.3	50	25			2	UV Fused Silica	Metallic ND Filter	$64.98
FNM0350 pdf	0.3	50		50	50	2	Borosilicate	Metallic ND Filter	$53.52
FNU0350 pdf	0.3	50		50	50	2	UV Fused Silica	Metallic ND Filter	$103.21
FNM0425 pdf	0.4	40	25			2	Borosilicate	Metallic ND Filter	$34.40
FNU0425 pdf	0.4	40	25			2	UV Fused Silica	Metallic ND Filter	$64.98
FNM0450 pdf	0.4	40		50	50	2	Borosilicate	Metallic ND Filter	$53.52
FNU0450 pdf	0.4	40		50	50	2	UV Fused Silica	Metallic ND Filter	$103.21
FNM0513 pdf	0.5	32	12.5			2	Borosilicate	Metallic ND Filter	$22.94
FNU0513 pdf	0.5	32	12.5			2	UV Fused Silica	Metallic ND Filter	$30.58
FNM0525 pdf	0.5	32	25			2	Borosilicate	Metallic ND Filter	$34.40
FNU0525 pdf	0.5	32	25			2	UV Fused Silica	Metallic ND Filter	$64.98
FNM0550 pdf	0.5	32		50	50	2	Borosilicate	Metallic ND Filter	$53.52
FNU0550 pdf	0.5	32		50	50	2	UV Fused Silica	Metallic ND Filter	$103.21
FNM0625 pdf	0.6	25	25			2	Borosilicate	Metallic ND Filter	$34.40
FNU0625 pdf	0.6	25	25			2	UV Fused Silica	Metallic ND Filter	$64.98
FNM0650 pdf	0.6	25		50	50	2	Borosilicate	Metallic ND Filter	$53.52
FNU0650 pdf	0.6	25		50	50	2	UV Fused Silica	Metallic ND Filter	$103.21
FNM0725 pdf	0.7	19	25			2	Borosilicate	Metallic ND Filter	$34.40
FNU0725 pdf	0.7	19	25			2	UV Fused Silica	Metallic ND Filter	$64.98
FNM0750 pdf	0.7	19		50	50	2	Borosilicate	Metallic ND Filter	$53.52
FNU0750 pdf	0.7	19		50	50	2	UV Fused Silica	Metallic ND Filter	$103.21
FNM0825 pdf	0.8	16	25			2	Borosilicate	Metallic ND Filter	$34.40
FNU0825 pdf	0.8	16	25			2	UV Fused Silica	Metallic ND Filter	$64.98
FNM0850 pdf	0.8	16		50	50	2	Borosilicate	Metallic ND Filter	$53.52
FNU0850 pdf	0.8	16		50	50	2	UV Fused Silica	Metallic ND Filter	$103.21
FNM1025 pdf	1	10	25			2	Borosilicate	Metallic ND Filter	$34.40
FNU1025 pdf	1	10	25			2	UV Fused Silica	Metallic ND Filter	$64.98
FNM1050 pdf	1	10		50	50	2	Borosilicate	Metallic ND Filter	$53.52
FNU1050 pdf	1	10		50	50	2	UV Fused Silica	Metallic ND Filter	$103.21
FNM1525 pdf	1.5	3.2	25			2	Borosilicate	Metallic ND Filter	$34.40
FNU1525 pdf	1.5	3.2	25			2	UV Fused Silica	Metallic ND Filter	$64.98
FNM1550 pdf	1.5	3.2		50	50	2	Borosilicate	Metallic ND Filter	$53.52
FNU1550 pdf	1.5	3.2		50	50	2	UV Fused Silica	Metallic ND Filter	$103.21
FNM2025 pdf	2	1	25			2	Borosilicate	Metallic ND Filter	$34.40
FNU2025 pdf	2	1	25			2	UV Fused Silica	Metallic ND Filter	$64.98
FNM2050 pdf	2	1		50	50	2	Borosilicate	Metallic ND Filter	$53.52
FNU2050 pdf	2	1		50	50	2	UV Fused Silica	Metallic ND Filter	$103.21
FNM3025 pdf	3	0.1	25			2	Borosilicate	Metallic ND Filter	$34.40
FNU3025 pdf	3	0.1	25			2	UV Fused Silica	Metallic ND Filter	$64.98
FNM3050 pdf	3	0.1		50	50	2	Borosilicate	Metallic ND Filter	$53.52
FNU3050 pdf	3	0.1		50	50	2	UV Fused Silica	Metallic ND Filter	$103.21

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