NEUTRAL DENSITY FILTER GLASS

Neutral density filters evenly absorb light across the visible spectrum. They are used to reduce transmittance of light in industrial and imaging applications. An excess of light can cause over-exposure in imaging applications. Lasers or other high intensity light sources can also cause damage to sensitive sensors.

Neutral density filters are also used to test the photometric accuracy of instruments such as spectrometers.



Filter
Nominal Thickness
(mm)
Thermal Expansion
( * E-7 °C-1)
Internal Transmittance (nm)
1001
1
55
< 1.0 E-4 (545)
1004
1
58
0.295 ± 0.03 (405)
0.335 ± 0.03 (545)
0.425 ± 0.04 (695)
1005
1
58
0.605 ± 0.03 (405)
0.615 ± 0.03 (545)
0.670 ± 0.03 (695)
1009
1
57
0.0325 ± 0.01 (405)
0.0525 ± 0.02 (545)
0.1075 ± 0.03 (695)
1011
1
59
0.825 ± 0.02 (405)
0.835 ± 0.02 (545)
0.835 ± 0.02 (695)

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