|
| Neutral-density Filter Sets |
|
When it is necessary to control the intensity level of the light,
these filters will attenuate a beam with very little effect
on the spectral content. Two types are in common use: absorbing
glass filters and reflective metallic coated filters. The metallic
coated filters are more spectrally neutral where-as the absorbing
glass filters may be combined additively. |
| |
| Specifications: |
| Surface Flatness |
2
per 25mm
Deviation Allowed From Catalog Nominal Density at
550nm: K0.02 density for densities of less than
0.5; K5% of density value at or above density 0.5
Accuracy of Spectrophotometer Curves Between 200nm
and 700nm: K1% of full scale |
| Clear Apertures |
23mm
and 48*48mm |
| Dimensions |
K0.2mm |
| Thickness |
2mm |
| Parallelism |
3 arc minutes |
| Substrates Material |
BK7 grade A fine Annealed or optical quality synthetic
fused silica |
| Cosmetic Surface Quality |
Pitch-polished, 80-50 scratch and dig |
| Coating Vacuum-deposited metallic
alloy |
|
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| |
