Neutral Density Filter (Inconel) Neutral Density Filters attenuate incident light by both the reflection and absorption characteristics of an inconel coating over a broad spectral range. Neutral Density Filters are typically used in attenuators for broad band spectral sources and partial reflector for light balancing applications.
Neutral Density Value The performance of a neutral density filter is defined as its Optical Density (O.D) O.D = Log10 ( Io/ IT ) Where Io =Incident Energy IT = Transmitted Energy

General Specification

Substrate :
- Optical glass (Range : 400mm to1200nm)
- Fused Silica (Range : 250mm to 1200nm)

Size Tolerance : +0.0mm,-0.25mm

Thickness : 2.0mm (nominal)

Surface/Coating Quality : F/F per MIL-F-48616

Filter Number Identification

ND	-	0.1	-	A
Filter Code	-	O.D	-	Size(A:F12.5mm B:F25.4mm C:F50.0mm)

Neutral Density Filter

Optical
Density

T ave (%)

Absolute Transmission
Deviation (nm)

Filter Number

250-400

400-750

750-1200

A:12.5mm B:25.4mm C:50.0mm

0.10
0.15
0.20
0.30

0.40
0.50
0.60
0.70

0.80
0.90
1.00
1.30

1.50
2.00

79.4%
70.8%
63.1%
50.1%

39.8%
31.6%
25.1%
20.0%

15.9%
12.6%
10.0%
5.0%

3.2%
1.0%

6.0%
6.0%
6.0%
6.0%

6.0%
5.0%
4.0%
3.0%

1.7%
0.7%

2.0%
2.0%
2.0%
2.0%

1.5%
1.5%
1.5%
1.5%

1.5%
1.0%
1.0%
1.0%

0.5%
0.2%

6.0%
6.0%
6.0%
6.0%

6.0%
5.0%
5.0%
3.0%

2.0%
1.0%

ND-0.1-
ND-0.15-
ND-0.2-
ND-0.3-

ND-0.4-
ND-0.5-
ND-0.6-
ND-0.7-

ND-0.8-
ND-0.9-
ND-1.0-
ND-1.3-

ND-1.5-
ND-2.0-

A
A
A
A

A
A

B
B
B
B

B
B

C
C
C
C

C
C