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ND04B

Optical Filter by Thorlabs Inc
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The ND04B from Thorlabs Inc is a Optical Filter with Wavelength 350 to 1100 nm, Center Wavelength(CWL) 633 nm, Filter Diameter 25 mm(0.98 Inch). More details for ND04B can be seen below.

Product Specifications

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Product Details

  • Part Number
    ND04B
  • Manufacturer
    Thorlabs Inc
  • Description
    Unmounted Reflective 25 mm ND Filter, Optical Density: 0.4

General Parameters

  • Filter Type
    Neutral Density Filter
  • Wavelength
    350 to 1100 nm
  • Center Wavelength(CWL)
    633 nm
  • Clear Aperture
    0.9
  • Optical Density
    0.4
  • Parallelism
    3 arcmin
  • Transmission
    0.4
  • RoHs
    Yes

Physical Properties

  • Filter Shape
    Round
  • Substrate/Material
    N-BK7
  • Thickness
    1.0 mm
  • Thickness Tolerance
    ± 0.25 mm
  • Filter Diameter
    25 mm(0.98 Inch)
  • Diameter Tolerance
    +0.0/-0.5 mm
  • Surface Accuracy
    5 λ
  • Surface Quality
    40-20 scratch-dig

Technical Documents
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