Pelham Research Optical

Substrate Sizes:
0.5" Dia. x 2mm
1.0" Dia. x 2.5mm
2.0" Dia. x 4mm

Substrate Specifications:
Diameter Tolerance: +0.00/0.005"
Thickness Tolerance: +/-0.25mm
Surface Figure: <2 Waves @ 632.8nm
Parallelism: <3 arc min
Scratch/Dig: 20-10
Bevel: 0.3-0.5mm x 45 Degrees
Clear Aperture: Central 85%

UV Metallic Neutral Density Filters

Pelham Research Optical (PRO) standard line of UV metallic neutral density (UVND) filters are available in optical densities from 0.3 to 4.0. PRO UV neutral density filters uniformly attenuate the intensity of transmitted light from 200m to 320nm and work on the principle of the combination of reflectance, transmission and absorption to achieve the desired optical density. Coatings can be applied to Customer Supplied Material as well as supplied build-to print complete from your supplied drawings.

Metallic neutral density (ND) filters for low power applications: Microscopy and Optical calibration.

All of PRO neutral density filters are covered and edge sealed. Please see our covered and sealed datasheet for more information.

Contact our Sales Department to order product, or Request a Quote.

All prices are subject to change at any time.

Click on highlighted wavelength to see curve. Opens in new window.

Optical Density (O.D.) 
Nominal Transmittance
Transmission Tolerance Plus or Minus %T 
0.5" Dia 
1" Dia
2" Dia
0.350%± 8% T0.3UVND-.5D0.3UVND-1D0.3UVND-2D
0.530%± 5% T0.5UVND-.5D0.5UVND-1D0.5UVND-2D
1.010%± 2.5% T1UVND-.5D1UVND-1D1UVND-2D
1.53%± 0.7% T1.5UVND-.5D1.5UVND-1D1.5UVND-2D
2.01%± 0.4% T2UVND-.5D2UVND-1D2UVND-2D
3.00.1%± 0.06% T3UVND-.5D3UVND-1D3UVND-2D
4.00.01%± 0.008% T4UVND-.5D4UVND-1D4UVND-2D

All Pelham Research Optical filters are supplied with individual UV % transmission calibration curve detailing their UV spectral performance.

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