50x50mm Absorptive VIS-NIR ND Filters

50x50mm Absorptive VIS-NIR ND Filters

50x50mm Absorptive VIS-NIR ND Filters

產品名稱 : 50x50mm Absorptive VIS-NIR ND Filters
產品說明 :
With their ability to minimize back-reflections and scattered light, absorptive neutral density (ND) filters are ideal for calibration. In contrast to the metallic type, absorption-type filters achieve their optical density by absorbing light within the substrate. For this reason, thickness is a key determinant of opacity. Because of their absorbing quality, these filters are suitable for low-power applications only.

The absorbing ND filters are unique in that they are AR coated to reduce surface reflections. Polished to TWF 1/4 wave or better, this enables them to be stacked without concern about losses and artifacts due to multiple reflections. Absorbing ND filters are perfect for imaging applications.

BENEFITS
● Ability to minimize back reflections and scattered light
● Suitable for low power applications

COMMON APPLICATIONS
● Photomicrography
● Machine vision
● Calibration
● Photography
● Scientific Measurements and research

產品規格
Dimension 50x50mm
Thickness 5mm (maximum)
Dimension Tolerance + 0.0/-0.25mm
Thickness Tolerance ± 0.5mm
Clear Aperture 90% of outside dimension
Surface Quality 80/50 per MIL-0-13830B
Max. Operating Temperature +100°C
Substrate Material Schott Absorption Glass
Spectral Range 450 - 700nm
Optical Quality TWF of λ/4 per inch and parallelism of 30 arc seconds or better
Mechanical Unmounted

Optical Density vs Transmission

Optical Density Density Tolerance @ 550nm (%) Nominal Transmission (%) Thickness (nm)
0.1 ± 20.00 79.43 4.95
0.2 ± 10.00 63.1 1.52
0.3 ± 10.00 50.12 2.84
0.4 ± 10.00 39.81 3.78
0.5 ± 10.00 31.62 2.11
0.6 ± 10.00 25.12 2.54
0.7 ± 10.00 19.95 2.95
0.8 ± 10.00 15.85 3.38
0.9 ± 10.00 12.59 1.75
1 ± 10.00 10 1.96
1.5 ± 10.00 3.16 2.9
2 ± 10.00 1 2.06
3 ± 10.00 0.1 2.92
4 ± 10.00 0.01 2.82


 
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