Neutral density filter
  • Neutral density filter
  • Neutral density filter
  • Neutral density filter

Neutral density filter

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Neutral density filter is often used in imaging or laser applications to avoid strong light damage to camera sensors or other optical components. ND filters absorb or reflect untransmitted light to evenly reduce transmission in a given part of the spectrum.

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BRD Optical makes fixed OD value neutral density filter by depositing Inconel film on a clear cubstrate. The advantage of the coated density filter is in the broader band and lower ripple than that of absorptive density filter. The coated wavelengthcan be extended to 200nm to 1100nm or more. Neutral density filterThe disadvantage is that there is some reflective light on the filter. The OD value can vary from 0.1 to 0.5. The OD value is controlled by coating inconel thin film Neutral density filterthickness. Regular thickness of the NDF is 1.1mm or 0.55mm.

MaterialBK7
Diameter   tolerance+0.0/-0.1mm
Thickness   tolerance±0.1mm
Parallelism<3 arc min
Flatnessλ~λ/10 
Clear aperture>90%
Density   tolerance±2%



Part No.Wanvelength   Range
    (nm)
Optical Density   (OD)
    @550nm
ND01400-11000.1
ND02400-11000.2
ND03400-11000.3
ND04400-11000.4
ND05400-11000.5
ND06400-11000.6
ND07400-11000.7
ND08400-11000.8
ND09400-11000.9
ND10400-11001
ND20400-11002
ND30400-11003
ND40400-11004
ND50400-11005



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