HIGH QUALITY OPTICAL COATING TECHNOLOGY

HIGH QUALITY OPTICAL COATING TECHNOLOGY

HIGH QUALITY OPTICAL COATING TECHNOLOGY

HIGH QUALITY OPTICAL COATING TECHNOLOGY

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Neutral Density Filter

Neutral Density Filter
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: 12.5mm B: 25.4mm C: 50.0mm)

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%
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%
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
A
A
A
A
A
A
A
A
 B
B
B
B
B
B
B
B
B
B
B
B
B
B
 C
C
C
C
C
C
C
C
C
C
C
C
C
C