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.
Note:
Wavelength cut-on listed in table is transition cut-on wavelength (T=Tmax/2)
Wavelength cut-off listed in table is transition cut-off wavelength (T=Tmax/2)
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
| 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 |
£20.63
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| 420FDL25 pdf | Longpass Dichroic Filter | 420 | 25.0 | 1.1 | Borosilicate |
£22.50
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| 420FDL50 pdf | Longpass Dichroic Filter | 420 | 50.0 | 50.0 | 1.1 | Borosilicate |
£38.50
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| 480FDL12 pdf | Longpass Dichroic Filter | 480 | 12.5 | 1.1 | Borosilicate |
£20.30
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| 480FDL25 pdf | Longpass Dichroic Filter | 480 | 25.0 | 1.1 | Borosilicate |
£21.95
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| 480FDL50 pdf | Longpass Dichroic Filter | 480 | 50.0 | 50.0 | 1.1 | Borosilicate |
£37.95
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| 490FDL12 pdf | Longpass Dichroic Filter | 490 | 12.5 | 1.1 | Borosilicate |
£20.30
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| 490FDL25 pdf | Longpass Dichroic Filter | 490 | 25.0 | 1.1 | Borosilicate |
£21.95
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| 490FDL50 pdf | Longpass Dichroic Filter | 490 | 50.0 | 50.0 | 1.1 | Borosilicate |
£37.95
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| 500FDL12 pdf | Longpass Dichroic Filter | 500 | 12.5 | 1.1 | Borosilicate |
£20.30
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| 500FDL25 pdf | Longpass Dichroic Filter | 500 | 25.0 | 1.1 | Borosilicate |
£21.95
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| 500FDL50 pdf | Longpass Dichroic Filter | 500 | 50.0 | 50.0 | 1.1 | Borosilicate |
£37.95
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| 510FDL12 pdf | Longpass Dichroic Filter | 510 | 12.5 | 1.1 | Borosilicate |
£20.30
|
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| 510FDL25 pdf | Longpass Dichroic Filter | 510 | 25.0 | 1.1 | Borosilicate |
£21.95
|
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| 510FDL50 pdf | Longpass Dichroic Filter | 510 | 50.0 | 50.0 | 1.1 | Borosilicate |
£37.95
|
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| 521FDL12 pdf | Longpass Dichroic Filter | 521 | 12.5 | 1.1 | Borosilicate |
£20.30
|
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| 521FDL25 pdf | Longpass Dichroic Filter | 521 | 25.0 | 1.1 | Borosilicate |
£21.95
|
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| 521FDL50 pdf | Longpass Dichroic Filter | 521 | 50.0 | 50.0 | 1.1 | Borosilicate |
£37.95
|
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| 530FDL12 pdf | Longpass Dichroic Filter | 530 | 12.5 | 1.1 | Borosilicate |
£20.30
|
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| 530FDL25 pdf | Longpass Dichroic Filter | 530 | 25.0 | 1.1 | Borosilicate |
£21.95
|
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| 530FDL50 pdf | Longpass Dichroic Filter | 530 | 50.0 | 50.0 | 1.1 | Borosilicate |
£37.95
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| 540FDL12 pdf | Longpass Dichroic Filter | 540 | 12.5 | 1.1 | Borosilicate |
£20.30
|
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| 540FDL25 pdf | Longpass Dichroic Filter | 540 | 25.0 | 1.1 | Borosilicate |
£21.95
|
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| 540FDL50 pdf | Longpass Dichroic Filter | 540 | 50.0 | 50.0 | 1.1 | Borosilicate |
£37.95
|
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| 550FDL12 pdf | Longpass Dichroic Filter | 550 | 12.5 | 1.1 | Borosilicate |
£20.30
|
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| 550FDL25 pdf | Longpass Dichroic Filter | 550 | 25.0 | 1.1 | Borosilicate |
£21.95
|
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| 550FDL50 pdf | Longpass Dichroic Filter | 550 | 50.0 | 50.0 | 1.1 | Borosilicate |
£37.95
|
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| 565FDL12 pdf | Longpass Dichroic Filter | 565 | 12.5 | 1.1 | Borosilicate |
£20.30
|
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| 565FDL25 pdf | Longpass Dichroic Filter | 565 | 25.0 | 1.1 | Borosilicate |
£21.95
|
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| 565FDL50 pdf | Longpass Dichroic Filter | 565 | 50.0 | 50.0 | 1.1 | Borosilicate |
£37.95
|
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| 581FDL12 pdf | Longpass Dichroic Filter | 581 | 12.5 | 1.1 | Borosilicate |
£20.30
|
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| 581FDL25 pdf | Longpass Dichroic Filter | 581 | 25.0 | 1.1 | Borosilicate |
£21.95
|
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| 581FDL50 pdf | Longpass Dichroic Filter | 581 | 50.0 | 50.0 | 1.1 | Borosilicate |
£37.95
|
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| 590FDL12 pdf | Longpass Dichroic Filter | 590 | 12.5 | 1.1 | Borosilicate |
£20.30
|
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| 590FDL25 pdf | Longpass Dichroic Filter | 590 | 25.0 | 1.1 | Borosilicate |
£21.95
|
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| 590FDL50 pdf | Longpass Dichroic Filter | 590 | 50.0 | 50.0 | 1.1 | Borosilicate |
£37.95
|
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| 600FDL12 pdf | Longpass Dichroic Filter | 600 | 12.5 | 1.1 | Borosilicate |
£20.30
|
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| 600FDL25 pdf | Longpass Dichroic Filter | 600 | 25.0 | 1.1 | Borosilicate |
£21.95
|
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| 600FDL50 pdf | Longpass Dichroic Filter | 600 | 50.0 | 50.0 | 1.1 | Borosilicate |
£37.95
|
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| 615FDL12 pdf | Longpass Dichroic Filter | 615 | 12.5 | 1.1 | Borosilicate |
£20.30
|
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| 615FDL25 pdf | Longpass Dichroic Filter | 615 | 25.0 | 1.1 | Borosilicate |
£21.95
|
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| 615FDL50 pdf | Longpass Dichroic Filter | 615 | 50.0 | 50.0 | 1.1 | Borosilicate |
£37.95
|
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| 625FDL12 pdf | Longpass Dichroic Filter | 625 | 12.5 | 1.1 | Borosilicate |
£20.30
|
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| 625FDL25 pdf | Longpass Dichroic Filter | 625 | 25.0 | 1.1 | Borosilicate |
£21.95
|
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| 625FDL50 pdf | Longpass Dichroic Filter | 625 | 50.0 | 50.0 | 1.1 | Borosilicate |
£37.95
|
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| 635FDL12 pdf | Longpass Dichroic Filter | 635 | 12.5 | 1.1 | Borosilicate |
£20.30
|
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| 635FDL25 pdf | Longpass Dichroic Filter | 635 | 25.0 | 1.1 | Borosilicate |
£21.95
|
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| 635FDL50 pdf | Longpass Dichroic Filter | 635 | 50.0 | 50.0 | 1.1 | Borosilicate |
£37.95
|
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| 645FDL12 pdf | Longpass Dichroic Filter | 645 | 12.5 | 1.1 | Borosilicate |
£20.30
|
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| 645FDL25 pdf | Longpass Dichroic Filter | 645 | 25.0 | 1.1 | Borosilicate |
£21.95
|
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| 645FDL50 pdf | Longpass Dichroic Filter | 645 | 50.0 | 50.0 | 1.1 | Borosilicate |
£37.95
|
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| 655FDL12 pdf | Longpass Dichroic Filter | 655 | 12.5 | 1.1 | Borosilicate |
£20.30
|
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| 655FDL25 pdf | Longpass Dichroic Filter | 655 | 25.0 | 1.1 | Borosilicate |
£21.95
|
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| 655FDL50 pdf | Longpass Dichroic Filter | 655 | 50.0 | 50.0 | 1.1 | Borosilicate |
£39.05
|
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| 740FDL12 pdf | Longpass Dichroic Filter | 740 | 12.5 | 1.1 | Borosilicate |
£20.63
|
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| 740FDL25 pdf | Longpass Dichroic Filter | 740 | 25.0 | 1.1 | Borosilicate |
£22.50
|
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| 740FDL50 pdf | Longpass Dichroic Filter | 740 | 50.0 | 50.0 | 1.1 | Borosilicate |
£39.05
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