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NE40B

Optical Filter by Thorlabs Inc
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The NE40B from Thorlabs Inc is a Optical Filter with Center Wavelength(CWL) 633 nm, Filter Diameter 25 mm (1.25 Inch). More details for NE40B can be seen below.

Product Specifications

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Product Details

  • Part Number
    NE40B
  • Manufacturer
    Thorlabs Inc
  • Description
    Unmounted 25 mm Absorptive ND Filter, Optical Density: 4.0

General Parameters

  • Filter Type
    Absorptive Neutral Density Filter, Neutral Density Filter
  • Center Wavelength(CWL)
    633 nm
  • Optical Density Tolerance
    ± 0.20
  • Parallelism
    10 arcsec
  • Transmission
    0.01%
  • RoHs
    Yes
  • Note
    Angle of Incidence Tolerance: λ/4

Physical Properties

  • Filter Shape
    Round
  • Substrate/Material
    NG9
  • Filter Diameter
    25 mm (1.25 Inch)
  • Diameter Tolerance
    0.0 / -0.25 mm
  • Surface Accuracy
    λ/4
  • Surface Quality
    40-20 scratch-dig

Technical Documents
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