Interference Filter (50mm)- 656nm C Line


Interference filters transmit only a narrow band of the spectrum and thus are essentially monochromatic filters. Three transmit at wavelengths 656nm, 589nm and 486nm corresponding to the C, D and F spectral lines respectively. The fourth filter transmits near 546nm (green) and is necessary for quantitative interference microscopy such as Berek or Senarmont compensation


Diameter (mm): 50.00 +0.0/-0.1
Center Wavelength CWL (nm): 656.00 ±2.0
Full Width-Half Max FWHM (nm): 10.00
Full Width-Half Max FWHM Tolerance (nm): ±2.0
Minimum Transmission (%): ≥85
Optical Density OD: ≥4.0
Coating: Hard Coated
Blocking Wavelength Range (nm): 200 – 1200
Clear Aperture CA (mm): 45.3
Surface Quality: 80-50
Angle of Incidence (°): 0
Durability:Environmental: MIL-STD-810F Paragraph 507.4
Physical: MIL-C-48497A Paragraph 3.4.1
Mount Thickness (mm): 5.0
Substrate: Optical Glass
Substrate Thickness (mm) :3.5 ±0.5 typical
Thickness Tolerance (mm) :±0.1

RoHS 2015 Compliant.

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