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Knight Optical’s complete range of cost effective longpass dichroic filters offer superior transmission, reflection and absorption characteristics.

Longpass filters are designed to transmit wavelengths higher than the cut on point and reflect all lower wavelengths. These dichroic longpass filters consist of thin-film dielectric coatings on glass with sharp transitions between the transmitted and reflected bands. Having negligible absorption they are suitable for high powers and do not show the strong fluorescence of certain glass filters.

Our dichroic longpass filters are available in a range of wavelengths and are supplied in standard 12.5mm and 25mm diameter or 50mm square types. We are happy to cut and edge filters for non standard sizes to suit your application.

Material:
Diameter:
Length/Width:
Thickness:
Surface Quality:
Wavelength Accuracy:
Clear Aperture:
Chamfer
Borosilicate or equivalent
+0/-0.20 mm
± 0.25 mm
± 0.20 mm
60/40 scratch/dig

+/-5nm
90%
Protective

Available size: Square 7mm-300mm, Diameter 10mm-400mm
Cutting down or edged to special shapes and sizes at short notice
Mounting of diameters and squares
Available in sets, supplied in a wooden storage box for research and laboratory use

Items 1-10 of 57

Name Type Wavelength cut-on (nm) 0 degree AOI Diameter (mm) Length (mm) Width (mm) Thickness (mm) Material Price Buy
420FDL12 pdf Longpass Dichroic Filter 420 12.5 1.1 Borosilicate
US$28.68
420FDL25 pdf Longpass Dichroic Filter 420 25.0 1.1 Borosilicate
US$31.28
420FDL50 pdf Longpass Dichroic Filter 420 50.0 50.0 1.1 Borosilicate
US$53.52
480FDL12 pdf Longpass Dichroic Filter 480 12.5 1.1 Borosilicate
US$28.22
480FDL25 pdf Longpass Dichroic Filter 480 25.0 1.1 Borosilicate
US$30.51
480FDL50 pdf Longpass Dichroic Filter 480 50.0 50.0 1.1 Borosilicate
US$52.75
490FDL12 pdf Longpass Dichroic Filter 490 12.5 1.1 Borosilicate
US$28.22
490FDL25 pdf Longpass Dichroic Filter 490 25.0 1.1 Borosilicate
US$30.51
490FDL50 pdf Longpass Dichroic Filter 490 50.0 50.0 1.1 Borosilicate
US$52.75
500FDL12 pdf Longpass Dichroic Filter 500 12.5 1.1 Borosilicate
US$28.22
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Longpass Dichroic Filters

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Wavelength cut-on (nm) 0 degree AOI